Steam Engine No. 517,900. Patented Apr. 10, 1894. Damir Kapustic / Thursday, October 14, 2021 Electro Magnetic Motor Commutator For Dynamo Electric Machines Print Tags patents Related articles Regulator For Alternate Current Motors Method Of Operating Electro Magnetic Motors Reciprocating Engine Commutator For Dynamo Electric Machines Electro Magnetic Motor