A Brief History of the Marque
Adolphe Herdtlé & Albert Bruneau were based at Rue de la Chine, Paris. In 1905 they introduced motorized roller skates to the public. Each skate contained a 1 hp motor; controls could then be affixed to the skater's belt, and would be linked via flexible cables to the skates. Top speed for the contraption was said to be a brakeless 66 km/h (41 mph). Unsurprisingly, the idea did not catch on, and the line of motorized skates was discontinued by the end of the year.
They are better known for their engines, described as aiv/ohev, typically very tall with a dozen or so small fins towards the top of the barrel on the aircooled engines. There were also water-cooled varieties, both singles of 170cc and 225cc, and 350cc V-twins. These were supplied to other companies including Marchand and the Italian firm Excelsior.
Sources: Wikipedia, Bonhams, MC Storico Conti