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| All Patents in class 175/391 | |||||
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| Number | Date | Patentee | Title | Type | |
| 47,812 | May 23, 1865 | W.W. Grier, R.H. Boyd | Improved drill-bit | drill bits | |
| 432,705 | Jul. 22, 1890 | A.V. Hartle | Earth Auger | augers | |