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| All Patents in class 251/279 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 550,742 | Dec. 03, 1895 | W.R. Campbell | Rotary Gas Engine | ||
| 816,217 | Mar. 27, 1906 | J. Chambers | Throttle Valve | ||
| 1,111,505 | Sep. 22, 1914 | F.E. Stevenson | Regulator for Hydraulic Steam Pumps | ||
| 2,151,658 | Mar. 21, 1939 | B.E. Folke | Injector | ||
| 2,199,158 | Apr. 30, 1940 | G.G. Hein, R.J. Statz, T.H. Buenger | Fluid pressure lifting jack | ||
| 2,505,975 | May 02, 1950 | M.E. Landon, Administratrix, W.S. Landon, deceased (Estate of) | Reciprocating Travel Controlling Means | ||