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| All Patents in class 175/388 | |||||
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| Number | Date | Patentee | Title | Type | |
| 492,118 | Feb. 21, 1893 | J.T. Snyder | Drilling machine (for mining coal, but brace configuration) | ||
| 627,659 | Jun. 27, 1899 | F.B. Spry | Expanding Auger | auger bits | |
| 843,399 | Feb. 05, 1907 | T.J. King | Weeding and Cultivating Device | ||