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| All Patents in class 175/255 | |||||
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| Number | Date | Patentee | Title | Type | |
| 9,961 | Aug. 23, 1853 | L.A. Walbach | Boring cannon | drilling and boring | |
| 1,254,268 | Jan. 22, 1918 | R.O. Pickin | Core Drill | ||
| 1,281,140 | Oct. 08, 1918 | W.R. Guiberson, R.A. Conkling | Drill | ||