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| All Patents in class 476/61 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,853,737 | Apr. 12, 1932 | E.R. Llewellyn | Power Transmission Mechanism for Lathes or the Like | engine lathes | |
| 2,173,608 | Sep. 19, 1939 | W.L. Groene | Change speed friction gearing | metalworking machine gearing | |