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

• Cadet 1965
• Enfants
• -
• 1963

I think that the correct labels might be:

• Simplex Prestige Cadet
• Simplex Prestige Promotion (511)
• Simplex Prestige Criterium (537)
• Simplex Prestige Criterium

• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: Simplex
• Derailleurs: Simplex Prestige Criterium, Simplex Prestige Criterium (537), Simplex Prestige Promotion (511), Simplex Prestige Cadet