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| All Patents in class 192/85.21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,488,736 | Apr. 01, 1924 | C.M. Conradson | Clutch Mechanism | metalworking machine mechanisms | |
| 1,938,780 | Dec. 12, 1933 | L.F. Nenninger, B. Sassen | Power Operated Clutch for Machine Tools | metalworking power transmission | |
| 2,257,364 | Sep. 30, 1941 | H.F. Bakewell | Machine tool | tapping machines | |