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| All Patents in class 251/208 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,042,782 | Jun. 02, 1936 | E.A. Hall | Dust Removing Means for Valve Seat Grinders or the Like | dust collectors | |
| 2,042,783 | Jun. 02, 1936 | E.A. Hall | Adjusting Means for Sleeve Bearings | industrial machine bearings | |
| 2,505,975 | May 02, 1950 | M.E. Landon, Administratrix, W.S. Landon, deceased (Estate of) | Reciprocating Travel Controlling Means | valves | |
| 2,971,366 | Feb. 14, 1961 | E. Tomkow | Gage Calibration Device | measurement gauges | |