This quote from a letter from Paul de Vivie implies that the Boizot Tri-direct derailleur was exhibited at the bicycle shows in the winter of 1910/11.

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

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• Publisher: T.C.F. Revue Mensuelle
• Country: France
• Date: February 1911
• Derailleur brands: de Vivie, Boizot
• Derailleurs: Boizot Tri-direct