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| All Patents in class 74/374 | |||||
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| Number | Date | Patentee | Title | Type | |
| 924,889 | Jun. 15, 1909 | G. Chedru | Variable Speed Gearing | motor vehicle gearing | |
| 1,103,784 | Jul. 14, 1914 | G.O. Leopold | Change-speed mechanism | drill presses | |
| 1,185,064 | May 30, 1916 | F.F. Clarke | Clutch Gearing for Machine Tools | industrial machine gearing | |