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

• Competition V
• SunTour V
• SunTour V Luxe
• SunTour V

I think that the correct labels might be:

• SunTour V
• SunTour V
• SunTour V Luxe
• SunTour V

• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: SunTour
• Derailleurs: SunTour V (2900), SunTour V, SunTour V Luxe (2902)