This article shows an early single-pulley Huret Course Pro with round pusher plates either side of the pulley.

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

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• Publisher: L'Officiel A.C.M.
• Country: France
• Date: March 1937
• Derailleur brands: Huret
• Derailleurs: Huret Course Pro