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

• Competition
• Competition Twin
• Competition V
• Competition

I think that the correct labels might be:

• SunTour Competition
• SunTour Competition Twin
• SunTour V
• SunTour Competition

• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: SunTour
• Derailleurs: SunTour Competition, SunTour Competition Twin, SunTour V (1st style)