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| All Patents in class 251/206 | |||||
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| Number | Date | Patentee | Title | Type | |
| 642,562 | Jan. 30, 1900 | H.F. Probert | Vaporizer for Gas Engines | fuel systems | |
| 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 | |