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| All Patents in class 192/69.8 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,218,784 | Mar. 13, 1917 | W.F. Groene, R.K. Le Blond | Positive Apron Drive for Lathes | engine lathes | |
| 2,016,806 | Oct. 08, 1935 | W.L. Schellenbach | Clutch | ||