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

• Shimano 500
• Shimano 400
• Dura-Ace
• Shimano 400

I think that the correct labels might be:

• Shimano 500
• Shimano 400
• Shimano Dura-Ace EX (7200)
• Shimano 400

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• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: Shimano
• Derailleurs: Shimano Dura-Ace EX black (7200), Shimano 500, Shimano 400, Shimano 400