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| All Patents in class 72/68 | |||||
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| Number | Date | Patentee | Title | Type | |
| 291,253 | Jan. 01, 1884 | F.C. Williams | Machine for Spinning Metals | metal spinning machines | |
| 1,273,441 | Jul. 23, 1918 | E.A. Bardwell | Method or Process of Nurling | pin punches | |