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

• New Skitter
• SunTour Skitter
• Grand Prix
• Hero

I think that the correct labels might be:

• SunTour Hero
• SunTour Skitter
• SunTour Grand Prix with a 'd'
• SunTour Hero

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