A Brief History of the Marque
The Ader motorcycles were designed and built by Clément Ader, a pioneer of aviation and telephone services at a factory in Levallois-Perret, Seine.
Motorcycles were built from 1901 to 1906 and comprised single cylinder models and a transverse V-twin with shaft drive marketed as the Moto-Cardan.
Ader is better known as a manufacturer of automobiles.
Sources: Henshaw, Wikipedia