| All Patents in class 310/219 |
Patents 1 -
6
of 6
      |
| Picture | Number | Date | Patentee | Title |
 | 120,057 | Oct. 17, 1871 | Z. Gramme, E.L. d'Ivernois | Improvement in magneto-electric machines |
| | 354,538 | Dec. 21, 1886 | F.B. Crocker, C.G. Curtis | Dynamo Electric Machine or Motor |
| | 382,845 | May 15, 1888 | N. Tesla | Commutator for Dynamo-Electric Machines |
 | 480,739 | Aug. 16, 1892 | H.F. Parshall | Commutator for electro-magnetic machines |
| | 642,743 | Feb. 06, 1900 | S. Evershed | Commutator for Electric Motors or Generators |
| | 909,834 | Jan. 12, 1909 | M. Walker | Brush Holder for Dynamo Electric Machines |
