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| All Patents in class 137/535 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 944,809 | Dec. 28, 1909 | H.C. McCarthy | Safety Valve | ||
 | 1,630,799 | May 31, 1927 | D.G. Murray | Compressor | |
| 2,040,542 | May 12, 1936 | C.S. Baker | Valve assembly | ||
| 2,355,916 | Aug. 15, 1944 | E. Klafstad | Relief Valve | ||