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| All Patents in class 175/400 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 574,980 | Jan. 12, 1897 | C. Bornet | Bit or Drill for Borers, &c., and Manufacture of Same | ||
| 945,735 | Jan. 04, 1910 | M. Hartsocg | Bit-chuck and bit | ||