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| All Patents in class 137/505.12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,335,824 | Nov. 30, 1943 | E.J. Dillman | Valve | gas and liquid valves | |
| 3,132,485 | May 12, 1964 | J.R. Watson | Hydraulic Motor Control | ||