A Brief History of the Marque
1926 to 1955
Sully sur Loire.
Les Ateliers Helyett began producing bicycles in 1926 and entered the motorcycle trade in the 1930s, building lightweight two-strokes, and touring machines powered by Chaise OHV singles and 750cc & 998cc JAP twins.
There was also an interesting shaft-drive V-twin of similar configuration to the Moto-Guzzi twins released in the late 1960s. The MH136 was powered by a transverse JAP sidevalve engine driving via cardan shaft to the rear wheel.
Subsequent to World War II they built mopeds and lightweights up to 125cc.
The firm continued to build bicycles until 1962, their bikes being very successful in racing having won Le Tour de France in 1957, 61 and 62.
Sources: jlbweb, helyett.com