Anciens Etablissements Pieper
Pieper petrol-electric car
From 1897, the company also produced cars. In 1900, Henri Pieper of Germany introduced a hybrid vehicle with an electric motor/generator, batteries, and a small gasoline engine. It used the electric motor to charge its batteries at cruise speed and used both motors to accelerate or climb a hill. The Pieper factory was taken over by Imperia, after Pieper died. Auto-Mixte, also of Belgium, built vehicles from 1906 to 1912 under the Pieper patents.
^ Georgano: The Beaulieu Encyclopedia of the Automobile
unblinkingeye.com Pieper History