DISRAELI DOCUMENTS
French Patent # 784,246
Publisher: L’Institut national de la propriété industrielle
Inventors: André Huret
Date: French application January 1935
Derailleur brands: Huret
Derailleurs: none
This patent appears to be for a chain tensioning device that would allow the rider to use two rear sprockets of different sizes. An essential gizmo for any fork type derailleur system.
