On January 26, 1875, George F. Green received U.S. Patent No. 159028 on an Electro-Magnetic Dental Tool (drill):

Green was a Kalamazoo, Michigan, inventor and dentist. His dental drill had an electromagnetic motor in it that operated by a rotating fan wheel that was controlled by a foot pedal.

Green was an amazingly prolific inventor earning at least 20 patents, the last few of which issued after his 1892 death: 236577, 238678, 260093, 265060, 277709, 338150, 338224, 338663, 381127, 386314, 388859, 390293, 432999, 465432, 465407, 473188, 504977, 506492, and 507493.