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| All Patents in class 192/37 | |||||
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| Number | Date | Patentee | Title | Type | |
| 821,984 | May 29, 1906 | V.J. Wahlstrom, B.T. Burchardi | Clutch and counter-shaft mechanism | friction clutches | |
| 954,661 | Apr. 12, 1910 | A.W. Whitcomb | Power-transmission device | industrial machine clutches | |