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

• Volante
• Synchro Memory
• Synchro Memory (Bridgestone)
• SunTour Love

I think that the correct labels might be:

• SunTour Volante
• Bridgestone SMS Max GT
• Bridgestone Synchro Memory Shift
• SunTour Volante

I think the SunTour Love (1600) had a smaller hanger bolt that the derailleur shown here.

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• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: SunTour
• Derailleurs: SunTour Volante, Bridgestone SMS Max GT, Bridgestone Synchro Memory Shift