A Brief History of the Marque
40 ter avenue de Sufrennes, Paris
Ader motorcycles were designed and built by Clément Ader, a pioneer of aviation and telephone services at a factory in Levallois-Perret, Seine.
Sources including Henshaw and Wikipedia suggest the following information which appears to be erroneous.
Ader is better known as a manufacturer of automobiles.
Sources: Henshaw, Wikipedia