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| All Patents in class 173/32 | |||||
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| Number | Date | Patentee | Title | Type | |
| 359,019 | Mar. 08, 1887 | J.C. Hyndman | Rock Drill | quarrying tools | |
| 639,267 | Dec. 19, 1899 | W.T. Moss | Mining Machine | mining apparatus | |
| 925,491 | Jun. 22, 1909 | G.S. Lowe | Machine for severing stay-bolts | boiler repair tools | |
| 1,285,712 | Nov. 26, 1918 | H.R. Hughes | Horizontal Drilling Machine | ||