There are no photo captions, but I think that the models from the top left are:

• Shimano 3.3.3.
• Shimano 3.3.3.
• Shimano 3.3.3.
• Shimano 3.3.3.

• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: Shimano
• Derailleurs: Shimano 3.3.3., Shimano 3.3.3., Shimano 3.3.3., Shimano 3.3.3.