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

• Super Olympic
• Lightweight Randonneur
• -
• Randonneur

I think that better labels might be:

• Cyclo Super Olympic. This is a product of the Cyclo Gear Company in the UK, not of the French Cyclo company
• Cyclo Randonneur Leger
• Some kind of variation of a Cyclo Sport
• Cyclo Randonneur

• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: Cyclo, Cyclo Gear Company
• Derailleurs: Cyclo Super Olympic, Cyclo Randonneur, Cyclo Randonneur Leger, Some kind of variation of a Cyclo Sport