|
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| US4292894 | 22 oct. 1979 | 6 oct. 1981 | Kabushiki Kaisha Sato Kenkyusho | Constant printing pressure mechanisms for label printing machine |
| US4649820 | 7 nov. 1984 | 17 mars 1987 | | Hand held impact printer |
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| US5307741 | 15 juin 1993 | 3 mai 1994 | Spring Line, Inc. | Impact hand stamping device |
