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

• Belri (Italy)
• Chaluret (France)
• Colombo (Mexico)
• On the black border; 'BSA (UK)'. On the photo itself; 'Four Star'

I think that slightly better labels might be:

• Belri (France) front derailleur - from St-Étienne not from Italy
• Chaluret 93 (France)
• Colombo (Mexico)
• BSA 4-Star (UK)

• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: Belri, BSA, Chaluret, Colombo
• Derailleurs: BSA 4-Star, Chaluret 93, Colombo