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| All Patents in class 91/240 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 816,348 | Mar. 27, 1906 | J.W. Miller | Cylinder Compression Relief Valve | ||
| 1,111,983 | Sep. 29, 1914 | L. Skinner, E.F. Williams | Automatic Exhaust Valve | ||
| 1,145,177 | Jul. 06, 1915 | A.D. Baker | Engine | ||
 | 1,285,475 | Nov. 19, 1918 | W. Turnwald | Automatic exhaust-valve | |
 | 2,000,553 | May 07, 1935 | C.R. Alden | Machine tool | |
 | 3,464,315 | Sep. 02, 1969 | H.A. Weyer | Mechanical pneumatic servo control system for high-speed impact devices | |