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| All Patents in class 251/248 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 132,130 | Oct. 15, 1872 | W.S. Bacon | Improvement in Gearings for Valve Movements for Steam Engines | ||
 | 180,444 | Aug. 01, 1876 | L.S. Woodbury | Improvement in fire-hydrants | |
| 1,570,700 | Jan. 26, 1926 | R.N. Murakami | Valve adjuster | ||
| 2,199,158 | Apr. 30, 1940 | G.G. Hein, R.J. Statz, T.H. Buenger | Fluid pressure lifting jack | ||
| 2,387,254 | Oct. 23, 1945 | W.A. Gigger | Control Device | ||