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| All Patents in class 137/492 | |||||
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| Number | Date | Patentee | Title | Type | |
| 754,467 | Mar. 15, 1904 | N. Lombard | Relief Valve | relief valves | |
| 2,522,783 | Sep. 19, 1950 | J.P. Golden | Hydraulic Pump and Circuit | hydraulic pumps | |