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

• Crane
• Titlist GT
• Shimano 600
• Titlist

I think that the correct labels might be:

• Schwinn GT400 Le Tour
• Shimano Titlist GT
• Shimano 600
• Shimano Titlist

• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: Schwinn, Shimano
• Derailleurs: Shimano Titlist (D601), Shimano Titlist GT, Shimano 600, Schwinn GT400 Le Tour