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

• Procyon
• Procyon
• Rod type
• Procyon

I believe that better labels might be:

• Sanko Procyon PV-I
• Sanko Procyon PV-III
• Sanko rod type front derailleur
• Sanko Procyon PV-III

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• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: Sanko
• Derailleurs: Sanko Procyon PV-I, Sanko Procyon PV-III