| All Patents in class 74/421A |
Patents 1 -
15
of 23
      |
| Number | Date | Patentee | Title | Type |
| 14,327 | Feb. 26, 1856 | J. Temple | Boring-machine | drilling and boring |
| 595,731 | Dec. 21, 1897 | M.B. Pengnet | Electric motor | electric motors |
| 693,837 | Feb. 25, 1902 | W.E. Canedy | Motor-gearing | |
| 805,499 | Nov. 28, 1905 | S.D. Stoycheff | Electric drill | handheld power drills |
| 1,104,736 | Jul. 21, 1914 | F. Schneider | Gearing | handheld power drills |
| 1,109,325 | Sep. 01, 1914 | W.O. Duntley | Electric drill | handheld power drills |
| 1,142,357 | Jun. 08, 1915 | R.A. Norling | Transmission gearing | handheld power drills |
| 1,356,297 | Oct. 19, 1920 | A.T. Lochner | Power-hammer | |
| 1,497,513 | Jun. 10, 1924 | G.L. Kelley | Machine for operating on floors or other surfaces | |
| 1,679,884 | Aug. 07, 1928 | H.T. Thomas | Attachment for drills | handheld power tool accessories |
| 1,698,827 | Jan. 15, 1929 | M. Skolnik | Mortising machine | mortising machines |
| 1,785,798 | Dec. 23, 1930 | T.C. Weiss | Motor driven tool | handheld power drills |
| 1,844,122 | Feb. 09, 1932 | L. Deutsch, G.W. Hoddy | Motor and drive connection | |
| 1,979,474 | Nov. 06, 1934 | D.C. Klausmeyer | Cartridge type drive gear assembly | radial drill presses |
| 2,320,379 | Jun. 01, 1943 | R.A. Niekamp | Electric motor gearing | gear motors |
