French Patent 406,967 Addition 12,871 - Boizot 2 speed scan 4

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French Patent # 406,967 Addition # 12,871
scan 4 of 4

Publisher: L’Institut national de la propriété industrielle
Document: French Patent # 406,967 Addition # 12,871 - Boizot
Date: French application June 1910
Derailleur brands: Boizot
Derailleurs: Boizot 2 speed, Boizot Tri-direct?

French Patent 406,967 Addition 12,871 - Boizot 2 speed scan 4 main image