There’s a lot of information here, particularly about the Terrot Rétro-directe. Note the most expensive options are the twin chain models.

Finally I like the convention that ‘percent’ is written ‘o/o’ rather than ‘%’.

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

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• Publisher: T.C.F. Revue Mensuelle
• Country: France
• Date: May 1904
• Derailleur brands: Terrot
• Derailleurs: none