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| All Patents in class 175/57 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,286,994 | Dec. 10, 1918 | G.H. Gilman | Method of Drilling Holes | ||
| 4,062,412 | Dec. 13, 1977 | W.A. McIlvanie | Flexible shaft drilling system | ||