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

• Juy 543 1955
• Juy 59 1959
• Tourist 28 1960
• Tourist 303 1956

I think that the correct labels might be:

• Simplex Juy 543
• Simplex Juy 59
• Simplex Tourist 303
• Simplex Tourist Monobloc 303

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• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: Simplex
• Derailleurs: Simplex Juy 543, Simplex Juy 59, Simplex Tourist 303, Simplex Tourist Monobloc 303