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

• Shimano Archery
• Pecker
• Pecker
• Pecker

• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: Shimano
• Derailleurs: Shimano Archery, various Shimano Pecker models