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| All Patents in class 173/30 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 273,136 | Feb. 27, 1883 | A. Noteman | Portable steam boring-engine | |
 | 481,598 | Aug. 30, 1892 | W.X. Stevens | Rock-drilling machine | |
| 494,461 | Mar. 28, 1893 | F.H. Cathcart | Power-Driven Tool | ||
 | 750,744 | Jan. 26, 1904 | J.F. Willey | Portable drill | |
 | 810,444 | Jan. 23, 1906 | C.W. Theil | Electric drill | |
 | 922,371 | May 18, 1909 | R. Winkler | Boring Machine | |