WO1997029459A1 - Security document validation - Google Patents
Security document validation Download PDFInfo
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- WO1997029459A1 WO1997029459A1 PCT/GB1997/000321 GB9700321W WO9729459A1 WO 1997029459 A1 WO1997029459 A1 WO 1997029459A1 GB 9700321 W GB9700321 W GB 9700321W WO 9729459 A1 WO9729459 A1 WO 9729459A1
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- WIPO (PCT)
- Prior art keywords
- document
- radiation
- validator
- regions
- banknote
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- 238000010200 validation analysis Methods 0.000 title claims description 26
- 238000000034 method Methods 0.000 claims abstract description 34
- 230000005855 radiation Effects 0.000 claims description 41
- 238000004458 analytical method Methods 0.000 claims description 18
- 238000012545 processing Methods 0.000 claims description 18
- 238000007689 inspection Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000003213 activating effect Effects 0.000 claims description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000003854 Surface Print Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
- G07D7/121—Apparatus characterised by sensor details
Definitions
- This invention concerns validators for, and methods for validating, security documents, in particular security documents comprising an embedded security device which is at least partially exposed by one or more exposure windows.
- security documents to be validated may be banknotes, cheques or similar documents of monetary value.
- Banknote validators or counterfeit detectors, of various forms are already known.
- Automatic banknote validators are used in machines which accept banknotes as a form of payment such as vending machines.
- Automatic validators use relatively sophisticated validation techniques, such as high resolution scanning of a banknote in visible light to produce a scanned image which is compared with that expected of a valid banknote.
- banknote validator is that used to augment the ability of a human operator to detect counterfeits.
- One such device which is relatively simple and inexpensive is known from International Patent Application No. W094/16 12. The device measures the ultraviolet fluorescence and reflectance characteristics of a banknote. Excessive levels of fluorescence can be detected in a counterfeit banknote, upon which the validator signals to the operator visibly and/or audibly to alert the operator to the invalidity of the banknote.
- Banknotes contain various security devices which are designed to be reproduced only with extreme difficulty, and to offer an immediate means of recognition of a valid banknote to the human eye.
- One such device is the security strip or thread which is incorporated into banknotes in a number of countries.
- the security thread usually consisting of a metallised plastics strip, is embedded in a banknote in such a manner that the thread is at least partially exposed by a number of windows which are located at spaced locations in the paper substrate.
- the security strip is visible at a number of locations corresponding to the positions of the windows in the paper, and in transmitted light the whole length of the security thread is visible.
- the security thread provides a further defence against counterfeiters.
- EP-A-0 059 056 describes a method in which a cylinder mould is used. A web of security thread is wound around the cylinder and supported by raised portions on the cylinder such that when paper fibres are deposited on the mould to produce paper webs, windows are produced corresponding to the raised portions of the mould. Windows might also be provided by embedding a security thread between two separately formed sheets of paper which are wet laminated or dry laminated together (see for example EP-A-0-229 645) . One or both of these sheets may be provided with apertures, or relatively thin regions, through which the security thread is exposed in the paper product.
- the windows, however formed are of greater length than necessary merely to expose the security thread across its width. This is due to the fact that the location of the security strip in the banknote paper is gradually varied so as to meander across the windows. As a result, when the banknotes produced are stacked into bundles, the positions of the security thread in the bundled banknotes are not all aligned, and extreme thickness of the bundles corresponding to the location of the security threads is avoided.
- the present invention provides a method of validating a document comprising an embedded security device which is partially exposed by one or more exposure windows, the method comprising the steps of inspecting the document in one or more regions and judging on the presence of said one or more exposure windows on the basis of said inspecting step to provide a validation signal.
- the windows associated with the security thread of a banknote are a feature which is difficult to reproduce and therefore suitable to provide for the relatively simple but effective validation of banknotes and detection of counterfeits.
- the inspecting step preferably comprises generating radiation, locating the document such that said radiation impinges on the document, and sensing radiation transmitted through the document in one or more regions adjacent said security device.
- the sensed radiation preferably comprises infra ⁇ red radiation.
- the surface printed inks on a security document such as a banknote are generally transparent to infra-red radiation, whereas thickness or density variations cause readily detectable differences in the amount of radiation transmitted.
- the presence of an exposure window in a document could theoretically be determined by sensing the intensity of radiation transmitted through a single region of the document, i.e. the window itself.
- a counterfeit could readily pass such a test and to improve reliability and e fectiveness it is preferred that radiation transmitted through a first region of the document is sensed to produce a first output and radiation transmitted through a second region of the document is sensed to produce a second output, which outputs are analysed to judge on the presence of said one or more exposure windows.
- the validation signal may be provided when said first output indicates that the sensed radiation has passed through an exposure window and said second output indicates that the sensed radiation has not passed through an exposure window.
- the outputs may be analysed in a number of ways which may be used alone or in combination. For instance, the analysis may involve taking a difference between the sensed outputs, or may involve taking a ratio of the outputs. The difference or the ratio may be subjected to predetermined criteria in order to determine whether a validation signal should be provided.
- the analysis may also involve comparing at least one of said outputs with a predetermined reference value or a predetermined range of values during said analysis.
- this analysis involves determining whether one of said outputs corresponds with that expected on detection of a valid window, and determining whether the other of said outputs corresponds with the detection of a valid region between, or outside, said one or more windows.
- the security device is a strip or thread, and said first and second regions through which the sensed radiation passes are spaced in a direction parallel to said security device.
- said first output is produced by a first sensor and said second output is produced by a second sensor.
- said inspecting step comprises moving a sensor relative to said document in a direction generally parallel to said security device, and said first and second outputs are produced sequentially during the movement. This reduces the number of sensors required in order to determine the presence or absence of the exposure windows in the security document.
- the inspecting step may comprise inspecting said document along a line to produce a profile of the document along said line, said validation signal being provided in response to, or in the absence of, the detection of a desired variation in said profile indicating the presence of said one or more exposure windows.
- the profile is preferably that of the transmission characteristics of said document along said line of inspection.
- the detection preferably involves detecting one or more windowed regions, and detecting one or more non-windowed regions.
- the profile is analysed to perform said judging, said analysis involving determining the geometric relationship of said detected windowed regions and said detected non-windowed regions along said line of inspection.
- the analysis may involve determining a periodic relationship between the two regions corresponding to the regular spacing of the windows, that may require an undue degree of processing.
- the analysis may involve taking a ratio of the length of one or more of the detected windowed regions along said line with the length of more or more of the detected non-windowed regions along said line.
- the inspecting step comprises inspecting the document simultaneously in at least two regions, said judging step comprising judging on the presence of said one or more exposure windows in any of said at least two regions.
- the security device is a thread, those at least two regions are preferably spaced in a direction transverse to the length of the thread.
- the present invention also provides apparatus comprising means for performing the method of the invention.
- such means may comprise one or more radiation emitting means and one or more radiation detecting means, at least one of said emitting means preferably being located on a first support means and at least one of said detecting means being opposedly located on a second support means, said first and second support means being separated by an opening into which a document is to be inserted by a human operator for inspection using the apparatus.
- the sensor pairs are preferably small in number (these may be less than ten) and arranged to inspect only a portion of the document.
- the apparatus may further comprise means for indicating to a human operator a desired disposition of the security device during inspection. This should ensure reliable sensing of the exposure windows, which are located in the area of the security device.
- a validator for security documents comprising sensor means for discriminating between valid and counterfeit security documents, switch means for activating said sensor means, and support means for said sensor means, wherein said support means comprise a first portion and a second portion separated by an opening for a document to be validated, said first portion being movable with respect to said second portion to actuate said switch means.
- Said sensor means preferably comprises radiation emitting means located on said first portion of the support means, and radiation sensing means located on said second portion of the support means.
- Said radiation sensing means may comprise an infra-red radiation sensor.
- the validator preferably comprises a plurality of radiation sensors providing a plurality of outputs to a processing means for analysing said plurality of outputs to provide a validation signal.
- Said processing means preferably analyses two or more of said outputs in combination to determine whether said validation signal should be given.
- the validator is preferably adapted so that when said support means is in said second relative position, a said sensor means may be moved relative to a document to be validated located between said first and second portions of the support means.
- said first and second portions preferably remain separated by an opening allowing a document to be validated to be moved relative to said sensor means.
- Fig. 1 is a plan view of a banknote to be validated
- Fig. 2 is a side view of a banknote validator according to one embodiment of the invention
- Fig. 3 is a side view of the validator of Fig. 3 during inspection of a banknote
- Fig. 4 is a schematic illustration of the electrical components of the validator of Figs. 2 and 3;
- Fig. 5 is a simplified portional plan view of the arrangement of Fig. 3 ;
- Fig. 6 is a side view of a banknote validator according to a different embodiment of the invention
- Fig. 7 is a schematic illustration of the electrical components of Fig. 6;
- Fig. 8 is a simplified portional plan view of the arrangement of Fig. 6; and Fig. 9 is a graph illustrating a transmission profile of a banknote generated using the validator of Fig. 4.
- the banknote 2 comprises a partially embedded security thread 4 exposed at a plurality of locations across the banknote 2 by a plurality of regularly spaced windows 6.
- the windows 6 are not readily visible by the human eye in reflected light, but are sometimes discernable by the human eye in strong transmitted light.
- the paper of the banknote is slightly thinner at the windows 6, and/or of lesser density in those windows 6.
- the regions of paper located immediately between the windows, herein referred to as "rungs" 8 are of equal or even slightly greater thickness and density as, or than, the remainder of the banknote 2.
- the width of the security thread 4 is approximately 1 mm, whereas the length of the windows 6 is approximately 2 cm.
- a hand-held banknote validator 32 has an elongate lower arm 34 and an elongate upper arm 36.
- the arms 34,36 are hingedly connected at one end, and have four sensor pairs located adjacent their free ends.
- the sensor pairs consist of four infra-red LEDs 10 located to project infra-red beams from the upper surface of the lower arm 36, and four infra-red photodiodes 12-15 located on the lower surface of upper arm 34 to receive the beams generated by the infra-red LEDs 10.
- the LEDs 10 and the photodiodes 12-15 are powered by one or more batteries, not shown in the diagrams.
- the outputs of the photodiodes 12-15 are amplified and fed to microprocessor 16 also located in the upper arm 36.
- Photodiodes 13-15 are not illustrated in Fig. 4, however they are connected to other inputs of the processing unit 16 in a manner similar to that of photodiode 12.
- the processing unit 16 has a built-in A/D converter for converting the input signals into the digital signals to be processed.
- the processing unit may be an 8-bit microprocessor such as that made by Motorola under the serial number 68HC11E9.
- Microprocessor 16 has an output connected to an indicating unit 13, which has one or more indicators, such as visible flashing LEDs and/or an audible signal generator.
- Both the processing circuitry 16 and the alarm unit 18 are also powered by the unillustrated battery source. Of course, a remote source of power could be utilised, but such remote source is not necessary providing a sufficiently low amount of power is required by the validator 32.
- the validator 2 is activated by squeezing the upper and lower arms 34,36 together.
- hand grips 20,22 are provided on the hinged end of the validator 32.
- the validator 32 is biassed to an open position, illustrated in Fig. 2, in which the lower arm 34 and upper arm 36 are held apart.
- the validator may be held by an operator in one hand at the end of the validator at which the grip portions 20 and 22 are located. Meanwhile, a banknote to be validated, held in the operator's other hand, may be inserted in the space between the validator arms 34,36.
- the lower arm 34 and upper arm 36 may be moved together to the activated position shown in Fig. 3.
- a switch 24 located adjacent the hinged end of the validator 32 is actuated upon closing of the validator arms 34,36.
- the free ends of the arms 34,36 remain spaced apart slightly to allow an inserted banknote lateral freedom of movement between the two arms 34,36.
- the LEDs 10 and photodiodes 12-15 of each sensor pair are in register.
- the LEDs 10 may each be provided with a lens and/or a collimating slit, and the photodiodes 12-15 may be provided with similar optical means to ensure the sensing of a beam of a desired resolution. Since the windows to be detected may have a width for example of 4 millimetres, it is preferred that the beams sensed are correspondingly narrow to produce the desired resolution. In cases where the validator 32 is intended for use with banknotes having windows of different dimensions, the dimensions of the beams sensed should also correspond to give sufficient resolution.
- the LEDs 10 and/or photodiodes 12-15 may also be provided with filters to ensure sensing at a predetermined wavelength or wavelengths.
- the banknote 2 is inserted between the validator arms 34,36 such that the security thread 4 lies parallel to, and between, the validator arms 34,36 as shown in Fig. 5.
- the sensor pairs 10,12-15 are spaced in a direction parallel to the length of the arms 34,36. The spacing is chosen so that when one photodiode 12 is located directly above a window 6 on the banknote 2, adjacent photodiodes 13 is located above a rung 8 between the windows 6 on the banknote.
- the other two photodiodes 14,15 have a similar relationship to one another and are arranged in an offset relation to photodiodes 12,13 so that when a window/rung combination is not clearly detectable by the two photodiodes 12,13, it is nevertheless ensured that a window/rung combination is detected by the two photodiodes 14, 15 when the validator 32 is properly located over the security strip.
- the two photodiodes 14,15 are also spaced from the other photodiodes 12,13 in a direction transverse to the length of the arms 34,36 so that, should two of the photodiodes be obscured by the opaque security strip 4, the rungs and windows can still be sensed by the other two photodiodes.
- other arrangements of sensor pairs 10,12-15 could be utilised to similar effect.
- the LEDs 10 When the validator is switched on, the LEDs 10 generate infra-red beams which are transmitted through the banknote to a greater or lesser degree according to the location of the windows 6 and rungs 8, and the photodiodes 12-15 sense the intensity of the transmitted radiation.
- the outputs of the photodiodes 12,13 are compared by the processing unit 16, by taking a ratio, to determine whether the ratio of intensities sensed corresponds to a predetermined value indicating the sensing of a window/rung combination.
- a similar operation could be performed by the use of comparators in addition to the processing unit 16.
- the processing unit 16 performs a similar analysis of the outputs of photodiodes 14,15.
- a validation signal indicating the genuine nature of a banknote 2 is generated, and a "valid" indication is given by the indicator unit 18 in response to a validation signal sent by processing unit 16.
- the indicating unit 18 may be caused to provide an alarm signal should the sensing not produce the desired variation in intensity of transmitted light across the banknote. Such an alarm signal may be produced upon reopening of switch 24 when the validator is released and returned to its open position shown in Fig. 2.
- the processing unit 16 may analyse the outputs from the photodiodes in ways other than simply taking the ratios of the outputs of photodiodes 12,13 or 14,15. For instance the circuitry 16 may analyse the outputs of the photodiodes to determine whether the absolute intensity of transmitted light sensed at one photodiode falls within a predetermined range of values corresponding to the presence of a window 6, and/or whether the absolute intensity of transmitted light sensed at a different photodiode corresponds with the presence of a rung 8. A difference between the outputs of two photodiodes could also be taken, to determine whether the difference falls within a range of predetermined values which indicate the detection of a window/rung combination.
- the sensors having outputs to be taken in combination need not be aligned in a parallel fashion, since the transmissivity of the banknote 2 could also be sensed not only in the region of windows 6 but also in any other region of the banknotes 2.
- the validator 40 comprises a processing unit 42 (which may be similar to microprocessor 16 described in relation to the previous embodiment) which is responsive to the outputs of two infra-red photodiodes 44,46.
- the photodiodes 44,46 are spaced by an amount greater that the width of the security strip 4 of a banknote to be sensed, for reasons to be explained below.
- LEDs 48,50 generate beams to be sensed by photodiodes 44,46 respectively.
- the output of photodiode 46 although not illustrated in Fig.
- LEDs 48,50 and photodiodes 44,46 may be provided with lenses, collimators or filters as described in relation to the previous embodiment.
- the validator 40 is also normally biassed in an open position, and may be activated by the application of manual pressure to close the arms 34,36. The validator 40 is illustrated in its activated position in Fig. 6.
- a banknote 2 is inserted between the upper and lower arms 36,34 of the validator 40 as shown in Fig. 8.
- the banknote is inserted such that the security thread 4 registers at least approximately with arrows 50,52 indicating the general location of the sensor pairs 44,48 and 46,50.
- the activated validator 40 is then swiped relative to the banknote 2 in a direction generally parallel to the security thread 4.
- the profile of an output generated by photodiode 44 when a valid banknote is swiped through the validator 40, or the validator is swiped across the banknote, is as illustrated in Fig. 9.
- the output (V) is plotted against time (t) . Before any part of the banknote passes between the sensor pair 44,48 the output is at a high level H.
- the intensity of transmitted light falls to a low level L.
- a windowed region 6 passes between the sensor pair 44,48 the transmissivity of the material increases due to the reduced thickness and/or density of the paper 5 is in the windowed region 6.
- the output of photodiode 44 then increases to an intermediate level W slightly above the low level L. After passing the first windowed portion 6, the output falls again to the low level L corresponding to the rung region 8, and thereafter the output varies periodically in a regular fashion between the intermediate level W and the low level L as more windows 6 and rungs 8 pass below the photodiode 44.
- the sensor pair 46,50 which is displaced from the sensor pair 44,48 in a direction perpendicular to the security thread 4 of a correctly inserted banknote (as shown in Fig. 8) also generally produces the output profile illustrated in Fig. 9. Therefore, the output of only one of the sensor pairs could generally be used as an indicator of the presence of the exposure windows 6. However, the second sensor pair is provided so that if the radiation beam of one sensor pair is blocked by the security thread 4 itself, or the security strip is at one extreme of the windows 6, the output of the remaining sensor pair can be relied upon to indicate on the presence of windows 6 in a valid banknote 2.
- the processing unit 42 could process the output of one or both sensor pairs in a number of different ways. For instance, the circuitry 42 may determine whether the output during activation of the validator 40 reaches a value within a range of allowed values centred on the low level L, and whether the output reaches one of a range of allowed values centred on the intermediate value W. A validation signal could be provided if both those conditions are met. To provide increased certainty, the number of times at which the output enters each, or one of, those ranges of values may be counted as the banknote is swiped through the validator. When a predetermined count is reached, a validation signal would be generated.
- the high output signal H may be utilised in order to calibrate the output of the photodiodes 44,46 which may vary due to various factors such as battery output power and LED efficiency.
- the profile illustrated in Fig. 9 corresponds to a swipe of relatively constant velocity. With such swipes, the total time over which the output remains at the low level L can be compared to the time over which the output remains at the intermediate level W to measure an aspect ratio which provides a further means of verification of the validity of the banknote 2.
- Non-uniform velocity swipes could be taken account of by sensing the velocity at which the banknote is swiped and compensating appropriately, although this would inevitably increase the complexity and cost of the validator 40.
- a further mode of validation could be provided by using a relatively constant velocity swipe and detecting the leading edge and trailing edge cf the banknote 2. The frequency of the detected window portions could then be compared with a predetermined range of frequencies attributed to genuine banknotes.
- FIG. 9 Another embodiments of the invention might include the utilisation of a linear CCD array and an associated illuminating source, which may be moved across the banknote in any direction and the signals appropriately processed to provide validation signals.
- the CCD array could be swiped in a direction either parallel with the security strip 4 or the perpendicular to the security strip .
- the CCD array is swiped in a direction perpendicular to the security thread 4, or the CCD array is located directly above the windows 6, an array of outputs having a profile as illustrated in Fig. 9 could be simultaneously generated. If the CCD array were swiped in a direction parallel to security thread 4, at least one of the CCD sensors would generate a time-varying output as illustrated in Fig. 9.
- any or all of the methods of validation described in relation to the illustrated embodiments may be used singly or in combination.
- the validator may not need to be intermittently actuable, but may have a simple on/off switch.
- it may not be necessary to detect radiation transmitted through windows at all since validation could be achieved by sensing only the transmissivity of the rung portions and that of the remainder of the banknote.
- mechanical sensing of thickness variations in the area of the window portions of a banknote might also be employed.
- the term “window” includes apertures in the security document, and regions of reduced density or thickness in the document.
- the term “exposed” meanwhile includes the possibility that a transparent or relatively thin layer is present over the security device in the area of a window.
- the invention is applicable not only to hand-held banknote validators, but also other human operated devices such as stationarily-mounted swipe-through validators, and automatic banknote validators.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT97902474T ATE254319T1 (en) | 1996-02-05 | 1997-02-05 | CHECKING SECURITY DOCUMENTS |
EP97902474A EP0891608B2 (en) | 1996-02-05 | 1997-02-05 | Security document validation |
AU16112/97A AU1611297A (en) | 1996-02-05 | 1997-02-05 | Security document validation |
US09/117,668 US6438262B1 (en) | 1996-02-05 | 1997-02-05 | Security document validation |
DE69726132T DE69726132T3 (en) | 1996-02-05 | 1997-02-05 | INSPECTION OF SECURITY DOCUMENTS |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9602260.3 | 1996-02-05 | ||
GB9602260A GB2309778B (en) | 1996-02-05 | 1996-02-05 | Security document validation |
Publications (1)
Publication Number | Publication Date |
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WO1997029459A1 true WO1997029459A1 (en) | 1997-08-14 |
Family
ID=10788117
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1997/000321 WO1997029459A1 (en) | 1996-02-05 | 1997-02-05 | Security document validation |
Country Status (8)
Country | Link |
---|---|
US (1) | US6438262B1 (en) |
EP (1) | EP0891608B2 (en) |
AT (1) | ATE254319T1 (en) |
AU (1) | AU1611297A (en) |
DE (1) | DE69726132T3 (en) |
ES (1) | ES2208869T5 (en) |
GB (1) | GB2309778B (en) |
WO (1) | WO1997029459A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
EP0891608A1 (en) | 1999-01-20 |
DE69726132T2 (en) | 2004-07-22 |
ATE254319T1 (en) | 2003-11-15 |
GB2309778B (en) | 2000-05-24 |
EP0891608B1 (en) | 2003-11-12 |
GB9602260D0 (en) | 1996-04-03 |
GB2309778A (en) | 1997-08-06 |
DE69726132D1 (en) | 2003-12-18 |
EP0891608B2 (en) | 2008-11-05 |
ES2208869T5 (en) | 2009-06-22 |
ES2208869T3 (en) | 2004-06-16 |
AU1611297A (en) | 1997-08-28 |
DE69726132T3 (en) | 2009-07-09 |
US6438262B1 (en) | 2002-08-20 |
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