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| All Patents in class 192/56.51 | |||||
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| Number | Date | Patentee | Title | Type | |
| 504,479 | Sep. 05, 1893 | E.W. Ross | Safety driving mechanism | industrial machine mechanisms | |
| 2,753,030 | Jul. 03, 1956 | W.A. Wight | Clutch apparatus | industrial machine mechanisms | |