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| All Patents in class 251/243 | |||||
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| Number | Date | Patentee | Title | Type | |
| 335,892 | Feb. 09, 1886 | J.P. Kern, J.C. Cosford | Steam Engine Governor | steam engine governors | |
| 861,714 | Jul. 30, 1907 | H.C. Dudgeon | Hydraulic jack | hydraulic jacks | |
| 1,395,551 | Nov. 01, 1921 | C.F. Brand | Snap Movement Valve Mechanism | industrial valves | |
| 2,214,272 | Sep. 10, 1940 | E.J. Dillman | Fuel Supply Control Means | flow controls | |
| 2,276,227 | Mar. 10, 1942 | E.J. Dillman | Control Device | temperature controls | |