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

• Skitter
• Grand Prix
• Grand Prix
• Grand Prix

• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: SunTour
• Derailleurs: SunTour Skitter, SunTour Grand-Prix