Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,170 pages of information and 233,417 images on early companies, their products and the people who designed and built them.
In 1900 a Belgian carmaker, Henri Pieper, introduced a 3-1/2 horsepower "voiturette" in which the small gasoline engine was mated to an electric motor under the seat. When the car was "cruising," its electric motor was in effect a generator, recharging the batteries. But when the car was climbing a grade, the electric motor, mounted coaxially with the gas engine, gave it a boost.
The Pieper patents were used by a Belgium firm, Auto-Mixte, to build commercial vehicles from 1906 to 1912.
E. and H. Hora made some under licence in the UK.