Nikola Tesla U.S. Patent 401,520 - Method of Operating Electro-Magnetic Motors Patent added March 1, 2015 - 12:20 AM
Nikola Tesla U.S. Patent 390,415 - Dynamo-Electric Machine or Motor Patent added March 1, 2015 - 12:20 AM
Nikola Tesla U.S. Patent 390,820 - Regulator for Alternate-Current Motors Patent added March 1, 2015 - 12:20 AM