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| All Patents in class 409/181 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,625,860 | Jan. 20, 1953 | J. Plester | Tool for Shaving Down Local Protuberances | ||
| 3,283,663 | Nov. 08, 1966 | C.E. Davis | High Speed Milling Apparatus | handheld milling apparatus | |