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| All Patents in class 91/457 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 500,271 | Jun. 27, 1893 | F. Phillips | Valve for engines | ||
| 675,112 | May 28, 1901 | R.A. Rutherford | Pneumatic Hoisting Apparatus | ||
| 2,388,832 | Nov. 13, 1945 | W.W. Criley | Control Mechanism | ||
 | 2,537,391 | Jan. 09, 1951 | H.F. Bakewell | Hydraulic ram device with intermittent high-pressure fluid supply | |