My random translations of the photo captions, from the top are:

• Huret Special Champion du Monde
• 1935

I think that the Huret Special Champion du Monde, shown here, is the same as the Huret Centrix Course used by Georges Speicher to win the 1933 World Championship road race.

• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: Centrix, Huret
• Derailleurs: Centrix Course, Huret