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| All Patents in class 251/367 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,173,536 | Feb. 29, 1916 | A.P. Phillips | Check Valve | industrial valves | |
| 1,189,764 | Jul. 04, 1916 | H.L. Whitman | Relief-valve for internal-combustion engines | internal combustion engines | |
| 1,502,650 | Jul. 29, 1924 | W.O. Ashe | Gauge Cock | boiler water gauges | |
| 2,436,701 | Feb. 24, 1948 | E.P. Sundholm | Grease Gun Head Construction | grease guns | |