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| All Patents in class 76/21 | |||||
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| Number | Title | Classification(s) | |||
| 8,199 | Machinery for Cutting Files | 76/16, 76/20, 76/21 | |||
| 14,189 | File Cutter | 76/21 | |||
| 15,867 | Cutting Round Files | 76/15, 76/21, 76/22 | |||
| 22,329 | File-cutting machine | 76/17, 76/21 | |||
| 237,350 | Chisel-holder for file-cutting machine | 125/36, 76/21 | |||
| 499,621 | Cutter-head for rasp-punching machine | 76/21 | |||
| 1,063,076 | File | 407/29.1, 451/541, 76/21 | |||