By 1929, Audouard have moved from St-Étienne to Veauche (18km to the north west) and seem to be concentrating their efforts on the Audouard Le Crack derailleur. This derailleur is, apparently, the only one that allows absolutely anyone to transform a bicycle into a 2 or 3 speed.

(Source gallica.bnf.fr/ Bibliothèque nationale de France)

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• Publisher: T.C.F. Revue Mensuelle
• Country: France
• Date: March 1929
• Derailleur brands: Audouard
• Derailleurs: Audouard Le Crack