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

• Velox
• Velox
• Nuovo Record
• Velox

I think that the correct labels might be:

• Campagnolo Velox
• Campagnolo Valentino Extra
• Campagnolo Nuovo Record
• Campagnolo Velox

• Publisher: New Cycling
• Document: New Cycling May 1981 - Derailleur Collection
• Date: May 1981
• Derailleur brands: Campagnolo
• Derailleurs: Campagnolo Velox (2250), Campagnolo Valentino Extra, Campagnolo Nuovo Record