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| All Patents in class 137/505.38 | |||||
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| Number | Date | Patentee | Title | Type | |
| 392,109 | Oct. 30, 1888 | J.R. Daly | Anti-Fluctuator for Gas engines | internal combustion engine governors | |
| 565,157 | Aug. 04, 1896 | E.N. Dickerson | Gas Mixer | carburetors | |
| 2,166,940 | Jul. 25, 1939 | C.M. Conradson | Hydraulic Power System | machine tool controls | |