Address: 6 Rue Gravel (1923), 7 Rue Gravel, Levallois France (1925)
Founded by P. Madoz, the firm also built bicycle auxilliary engines under the name PM.
1923 Propulcycle 99cc belt drive
1926 175cc side-valve chain drive
1929 Duten 250cc engine with 3-speed gearbox, brakes front and rear.
Undated model with 500cc block-moteur, possibly Chaise. Image at Moto Jouvence.
Sources Cyclememory.org et al.