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| All Patents in class 60/490 | |||||
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| Number | Date | Patentee | Title | Type | |
| 925,148 | Jun. 15, 1909 | H.D. Williams | Variable Speed Gear | industrial machine speed and direction changing mechanisms | |
| 2,381,741 | Aug. 07, 1945 | C.E. Grosser | Pump or motor unit | hydraulic pumps | |