Pieper was a carmaker in Belgium.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 original Pieper was a voiturette with a single-cylinder 31/2hp, or a 6hp 2-cylinder engine, and belt drive.
In 1900 these were joined by an electric two- seater with a range of 50 miles per charge, and also by a petrol-electric car .This had the same appearance as the pure electric, but had a 31/2hp petrol engine coupled to an electric motor under the seat. In 1902 a 12hp 4-cylinder chain-drive tonneau was made. Later Auto-Mixte petrol-electric vehicles were made to Pieper designs,.
GNG Auto-Mixte, also of Belgium, built vehicles from 1906 to 1912 under the Pieper patents.