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| Patents for Franz Krein | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 222,509 | Dec. 09, 1879 | F. Krein | Improvement in hame-dressing machines | |
 | 222,510 | Dec. 09, 1879 | F. Krein | Cutter-head for hame-dressing machine | |