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| All Patents in class 175/401 | |||||
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| Number | Date | Patentee | Title | Type | |
| 387,448 | Aug. 07, 1888 | H.W. Richards | Auger | auger bits | |
| 1,257,561 | Feb. 26, 1918 | W. Weber | Chamering Device for Rock Drills | ||