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| All Patents in class 175/40 | |||||
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| Number | Date | Patentee | Title | Type | |
| 62,849 | Mar. 12, 1867 | T. Hofstatter | Improvement in Augers | countersinks | |
| 155,333 | Sep. 22, 1874 | W.L. Parmelee | Improvement in expansion-bits | adjustable drill bits | |