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| All Patents in class 251/344 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 596,639 | Jan. 04, 1898 | W.W. Tucker | Oil-cup | |
| 1,695,777 | Dec. 18, 1928 | R.A. Norling | Reversible drill throttle | ||
| 2,027,579 | Jan. 14, 1936 | J. De Mooy | Exhaust Deflector | ||