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

• -
• L. Juy
• L. Juy
• -

I think that the correct labels might be:

• Simplex LJ4000 CP/SP
• Simplex SLJ5500 CP/SP
• Simplex SLJ6000 T/SP
• Simplex SX410 T/P

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• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: Simplex
• Derailleurs: Simplex SLJ6000 T/SP, Simplex SLJ5500 CP/SP, Simplex LJ4000 CP/SP, Simplex SX410 T/P