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| All Patents in class 173/203 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 941,093 | Nov. 23, 1909 | J.L. Painter | Power Hammer | ||
 | 1,356,297 | Oct. 19, 1920 | A.T. Lochner | Power-hammer | |
| 1,660,579 | Feb. 28, 1928 | J. Roth | Hammer drill attachment for electric drill | ||
| 1,798,082 | Mar. 24, 1931 | E.B. Grutzbach | Hammer attachment for electric drills | ||
 | 1,803,307 | Apr. 28, 1931 | O.P. Wodack | Portable electric tool | |
 | 1,889,441 | Nov. 29, 1932 | J.F. Haas | Combined rotary and reciprocatory drill | |
 | 2,408,484 | Oct. 01, 1946 | A.R. Schwarzkopf | Percussive tool | |