M. Rocher had factories in Cenon near Chatellerault at the beginning of the 50s.
This was a large industrial group that produced Cucciolo engines under license, and supplied them to a number of small French manufacturers. The Rocher company had up to 2000 employees. In 1952 and 1953 sales declined, and the factories closed around 1956.
ERIAC (Etudes Réalisations Industrielles, Administratives, Commerciales) was a subsidiary of Rocher.