| All Patents in class 200/7 |
Patents 1 -
8
of 8
      |
| Picture | Number | Date | Patentee | Title |
| | 519,338 | May 08, 1894 | J.F. McElroy | Electric Switch |
 | 524,396 | Aug. 14, 1894 | W.B. Potter | Controller for Electric Motors |
 | 583,935 | Jun. 08, 1897 | F.E. Case, W.B. Potter | Series Parallel Controller |
 | RE12,241 | Jul. 19, 1904 | W.B. Potter | Controller for Electric Motors |
 | 871,970 | Nov. 26, 1907 | E.W. Stull | System of motor control |
| | 991,431 | May 02, 1911 | W.O. Duntley | Controller for electric drills |
| | 1,016,071 | Jan. 30, 1912 | J.T. Janette | Electric switch |
| | 2,478,929 | Aug. 16, 1949 | E. Lochman | Machine tool |
