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

• Gian Robert Cyclo
• Gian Robert Cyclo
• -

I think that better labels might be:

• Cyclo Campione
• Cyclo Witmy
• Gian Robert Campione

The two Cyclo derailleurs were manufactured by Gian Robert for Cyclo.

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• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: Cyclo, Gian Robert
• Derailleurs: Cyclo Campione, Cyclo Witmy, Gian Robert Campione