This model, without the chain retaining device marked 12, is the Simplex Bordeaux-Paris.

One interesting feature of this patent is that it may show the first recognisably modern rear dropout with an integral derailleur hanger.

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• Publisher: L’Institut national de la propriété industrielle
• Inventor: Lucien Juy
• Country: France
• Date: French application March 1932
• Derailleur brands: Simplex
• Derailleurs: Simplex Bordeaux-Paris