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| All Patents in class 91/505 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 924,787 | Jun. 15, 1909 | R. Janney | Variable Speed Transmission Device | ||
| 925,148 | Jun. 15, 1909 | H.D. Williams | Variable Speed Gear | ||
 | 1,722,832 | Jul. 30, 1929 | D.H. West | Hydraulic transmission | |
| 1,945,391 | Jan. 30, 1934 | E. Benedek | Pump | ||
| 2,015,423 | Sep. 24, 1935 | R.E. Flanders | Hydraulic Pump or Motor | ||
 | 2,520,632 | Aug. 29, 1950 | J. Greenhut | Hydraulic pump or motor | |