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| All Patents in class 175/397 | |||||
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| Number | Date | Patentee | Title | Type | |
| 39,235 | Jul. 14, 1863 | R. Leschot | Tool for boring rock | mining apparatus | |
| 2,673,714 | Mar. 30, 1954 | J.M. Hargrave | Rock or masonry drill | drill bits | |