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| All Patents in class 476/48 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,017,877 | Feb. 20, 1912 | A.B. Landis | Change-speed gearing | industrial machine gearing | |
| 2,617,309 | Nov. 11, 1952 | W.G. Tyson, K.H. Casson | Variable-speed friction drive | ||