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| All Patents in class 74/10.52 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,299,765 | Apr. 08, 1919 | C.H. Norton, A. Turner | Multiple-speed device | surface grinders | |
| 1,305,616 | Jun. 03, 1919 | N.H. Norris | Combination differential direct-power drive and friction-clutch pulley | industrial machine clutches | |