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| All Patents in class 192/109B | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,625,738 | Apr. 19, 1927 | L.F. Nenninger | Machine Tool Clutch | milling machines | |
| 1,844,122 | Feb. 09, 1932 | L. Deutsch, G.W. Hoddy | Motor and drive connection | ||