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| All Patents in class 251/28 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,224,272 | May 01, 1917 | W.H. Callan | Unloader for Air Compressors | |
| 2,403,427 | Jul. 02, 1946 | O.H. Ludeman | Valve Mechanism | ||
| 2,566,173 | Aug. 28, 1951 | E.J. Dillman | Pilot Operated Valve | ||