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| All Patents in class 251/86 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 290,450 | Dec. 18, 1883 | C. Ahrens | Safety-valve | |
| 395,536 | Jan. 01, 1889 | H.G. Ashton | Safety-valve | ||
| 794,034 | Jul. 04, 1905 | F.A. Hannah, J.H. Millett | Steam Safety Valve | ||
| 1,111,391 | Sep. 22, 1914 | S.L. Kneass | Valve | ||
| 1,226,040 | May 15, 1917 | N.W. Whitbeck | Valve | ||
| 2,198,070 | Apr. 23, 1940 | D.D. Wile | Pressure Valve | ||