E. R. Thomas Motor Company was a manufacturer of motorized bicycle

Motorized bicycle

A motorized bicycle, motorbike, cyclemotor, or vélomoteur is a bicycle with an attached motor and transmission used either to power the vehicle unassisted, or to assist with pedaling. Since it always retains both pedals and a discrete connected drive for rider-powered propulsion, the motorized...

s, motorized tricycles, motorcycles, and automobile

Automobile

An automobile, autocar, motor car or car is a wheeled motor vehicle used for transporting passengers, which also carries its own engine or motor...

s in Buffalo, New York

Buffalo, New York

Buffalo is the second most populous city in the state of New York, after New York City. Located in Western New York on the eastern shores of Lake Erie and at the head of the Niagara River across from Fort Erie, Ontario, Buffalo is the seat of Erie County and the principal city of the...

 between 1900 and 1919.
In 1896, E.R. Thomas of Buffalo, New York began selling gasoline engine kits for propelling ordinary bicycle

Bicycle

A bicycle, also known as a bike, pushbike or cycle, is a human-powered, pedal-driven, single-track vehicle, having two wheels attached to a frame, one behind the other. A person who rides a bicycle is called a cyclist, or bicyclist....

s. After forming the Thomas Motor Company, he began selling complete motor-assisted bicycles under the name Auto-Bi. The Auto-Bi is generally considered to be the first production motorized bicycle made in the United States.