Reviewing the the Paris Salon of 1933, this article lists the following derailleurs:

• Detail changes to Le Cyclo to make it lighter.
• A new Chemineau three speed, single pulley, racing model operated by a lever behind the saddle pulling a cable that runs down the right seat stay. I have never seen a picture of this design.
• Lucien Juy’s Simplex
• Oscar Egg’s Super Champion
• Le Famery which had no lever, but was operated by pedaling backwards.
• Francis Pelissier’s racing design, which was possibly a fork design.
• Caminade’s Rectiligne which used a sliding cassette and a straight chainline - in the style of the Audouard.

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

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• Publisher: T.C.F. Revue Mensuelle
• Country: France
• Date: February 1934
• Derailleur brands: Audouard, Caminade, Chemineau, Cyclo, Peugeot, Simplex, Super Champion, Terrot
• Derailleurs: Le Chemineau single pulley racing model, Le Cyclo 4 speed, Le Simplex, Super Champion