Apparatus for imprinting patient or subject identifying information in the form of a barcode on unexposed X-ray film employing a light and lens system utilizing a negative LCD to cast the shadow for exposure on the film. The light and lens system employs a point light source and a light path which is...http://www.google.fr/patents/US5389771?utm_source=gb-gplus-shareBrevet US5389771 - Barcoding
