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| All Patents in class 175/420.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,673,714 | Mar. 30, 1954 | J.M. Hargrave | Rock or masonry drill | drill bits | |
| 2,919,902 | Jan. 05, 1960 | M.J. Steffes | Masonry drill | ||
| 4,595,322 | Jun. 17, 1986 | B. Clement | Spade drill bit | drill bits | |