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| All Patents in class 254/42 | |||||
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| Number | Date | Patentee | Title | Type | |
| 298,639 | May 13, 1884 | C.A. Ver Genius | Printer's Quoin | auxiliary wrenches | |
| 2,010,759 | Aug. 06, 1935 | E.A. Hall | Pilot Stem | valve grinding tools | |