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| All Patents in class 475/178 | |||||
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| Number | Date | Patentee | Title | Type | |
| 306,375 | Oct. 14, 1884 | J.F. Allen | Portable drilling-machine | portable metal boring and drilling machines | |
| 3,145,585 | Aug. 25, 1964 | S.S. Brown | Epi-cycle gear train for floor polisher motor | gear motors | |