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

• Mercier (France)
• Sun-Bow (Taiwan)
• Super (Taiwan)
• Spirax (France)

I think that slightly better labels might be:

• Mercier Valor (France)
• Sun-Bow YA100 (Japan - not Taiwan)
• Super (Taiwan) - I have no information about this derailleur
• Le Spirax (France)

• Publisher: New Cycling
• Document: New Cycling May 1981 - Derailleur Collection
• Date: May 1981
• Derailleur brands: Mercier, Spirax, Sun-Bow
• Derailleurs: Mercier Valor, Le Spirax, Sun-Bow YA100 (2nd style), 'Super' - whatever this may be