On December 23, 1879, Thomas Edison patented Magneto-Electric Machine.
The invention helps increase the effectiveness of the revolving armature.
Publication number: US222881 A
Patent Title: Improvement in magneto-electric machines
Publication type: Grant
Publication date: Dec 23, 1879
Filing date: Sep 10, 1879
Publication number: US 222881 A, US 222881A, US-A-222881, US222881 A, US222881A
Inventors: Thomas A. Edison