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| All Patents in class 251/360 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 556,037 | Mar. 10, 1896 | C.W. Weiss | Valve | |
 | 1,604,776 | Oct. 26, 1926 | F. Hardinge | Valve | |
| 2,017,154 | Oct. 15, 1935 | E.T. Larkin | Valve Seat Construction for Engines and the Like | ||
| 2,021,773 | Nov. 19, 1935 | P.H. Gentzel | Relief Valve | ||
| 2,414,751 | Jan. 21, 1947 | O.H. Ludeman | Valve | ||
 | 2,815,040 | Dec. 03, 1957 | R.V. Smith | Pressure relief valve | |
| 3,084,899 | Apr. 09, 1963 | C.L. Gschwind, L.A. Dever | Manual Three Direction Tracer | ||