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| All Patents in class 251/296 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,199,158 | Apr. 30, 1940 | G.G. Hein, R.J. Statz, T.H. Buenger | Fluid pressure lifting jack | automobile and truck jacks | |
| 2,355,916 | Aug. 15, 1944 | E. Klafstad | Relief Valve | steam safety valves | |