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| All Patents in class 251/121 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,167,433 | Jul. 25, 1939 | G.B. Duffield | Air Vent Valve | valves | |
| 2,497,223 | Feb. 14, 1950 | W.S. Landon | Orifice Cleaning Means | pipe and orifice cleaners | |
| 3,067,768 | Dec. 11, 1962 | J.L. Burg | Temperature compensated hydraulic control device | drill presses | |