Robert Oubron (b. April 18, 1913) was a cycling world champion in many of the years from 1936 to 1946.
Early in the 1950s he opened a shop in Paris selling bicycles and mopeds, some of which were rebadged under his own name as Oubron, Robert Oubron, sometimes R. Oubron. These included the Eriac from Rocher and probably Genial-Lucifer. His machines were powered by Myster, Junior, SER (Ets Louis Serouge) and others.
The address of the shop was 26, avenue de l'Opera, Paris, and is also given as 84, Rue Des Sorins, Montreuil (Seine).
Sources: moto-scooter-annee50-60.over-blog.com, et al
