| All Patents in class 310/50 |
Patents 1 -
10
of 73
      |
| Picture | Number | Date | Patentee | Title |
 | 606,549 | Jun. 28, 1898 | E. Holmes | Portable electric drill |
 | 750,744 | Jan. 26, 1904 | J.F. Willey | Portable drill |
 | 781,062 | Jan. 31, 1905 | D.J. Hauss, C.W. Miles | Electric or hand-powered breast drill |
 | 809,394 | Jan. 09, 1906 | A. Pedersen | Electrically-operated portable drill |
 | 810,444 | Jan. 23, 1906 | C.W. Theil | Electric drill |
 | 956,849 | May 03, 1910 | W.C. Hafemeister | Portable electric drill |
 | 979,143 | Dec. 20, 1910 | E.F. Faure | Controlling device for electrical apparatus |
 | 1,004,437 | Sep. 26, 1911 | A. Kimble | Alternating-current motor |
 | 1,026,904 | May 21, 1912 | J. Burke | Electric motor |
 | 1,062,799 | May 27, 1913 | G.H. Rowe | Rock drill |
