Chalumeau, supposedly a manufacturer that you could trust, was offering a 2 speed bicycle with 2 brakes in 1906.

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

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• Publisher: T.C.F. Revue Mensuelle
• Country: France
• Date: April 1906
• Derailleur brands: Chaluret
• Derailleurs: unknown