| All Patents in class 74/56 |
Patents 1 -
10
of 10
      |
| Picture | Number | Date | Patentee | Title |
 | 694 | Apr. 14, 1838 | C. Learned, S. Waterman | Brick Machine |
| | 127,747 | Jun. 11, 1872 | J. Donnelly | Improvement in Apparatus for Operating Steam-Engine |
| | 602,693 | Apr. 19, 1898 | S.P. Blackmore | Rock or Like Drill |
 | 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 |
 | 1,679,884 | Aug. 07, 1928 | H.T. Thomas | Attachment for drills |
| | 2,215,222 | Sep. 17, 1940 | D.D. Levy | Dental Tool Holder |
 | 2,408,484 | Oct. 01, 1946 | A.R. Schwarzkopf | Percussive tool |
| | 2,728,974 | Jan. 03, 1956 | C.E. Miller | Automatic Lathe |
| | 2,903,234 | Sep. 08, 1959 | H. Steinhauer, V.v. Sundt | Timed Valve with Cam Actuator |
