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| All Patents in class 251/367 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,173,536 | Feb. 29, 1916 | A.P. Phillips | Check Valve | ||
 | 1,189,764 | Jul. 04, 1916 | H.L. Whitman | Relief-valve for internal-combustion engines | |
| 1,502,650 | Jul. 29, 1924 | W.O. Ashe | Gauge Cock | ||
 | 2,436,701 | Feb. 24, 1948 | E.P. Sundholm | Grease Gun Head Construction | |
| 3,039,489 | Jun. 19, 1962 | L.A. Botkin | Valve structure | ||