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| All Patents in class 175/323 | |||||
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| Number | Date | Patentee | Title | Type | |
| 62,849 | Mar. 12, 1867 | T. Hofstatter | Improvement in Augers | countersinks | |
| 2,863,640 | Dec. 09, 1958 | G.A. Petersen | Offset Boring Head for Auger | well digging or drilling tools | |