French Patent # 838,657 Addition # 50,153 - Nivex

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French Patent # 838,657 Addition # 50,153 - Nivex

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Publisher: L'Institut national de la propriété industrielle
Inventor: Pierre Gardini, Georges Trottier and René Déchanet
Country: France
Date: Priority date August 1938
Derailleur brands: Nivex
Derailleurs: Nivex

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