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| All Patents in class 137/522 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 7,886 | Jan. 07, 1851 | W. Maguire | Machine for jointing staves | |
 | 59,764 | Nov. 20, 1866 | C.M. Farrar | Improvement in Lock-Up Safety Valve | |
| 90,278 | May 18, 1869 | J. Linnard | Safety Valve | ||
| 206,589 | Jul. 30, 1878 | F. Lunkenheimer | Safety-Valve | ||
 | 571,498 | Nov. 17, 1896 | E. Rappe | Gas Engine | |
| 920,472 | May 04, 1909 | W.E. Jerauld | Testing Attachment for Spring Loaded Valves | ||
| 1,865,560 | Jul. 05, 1932 | G.B. Duffield | Pop Valve | ||
 | 2,101,682 | Dec. 07, 1937 | E. Klafstad | Relief Valve | |