Jose Caeiro da Matta, Minister of Foreign Affairs, signs the North Atlantic Treaty for Portugal, April 4, 1949. Jose Caeiro da Matta, Minister of Foreign Affairs, signs the North Atlantic Treaty for Portugal, April 4, 1949. SHARE: Download: Full Size (2.07 MB) Tags: photo essays Credit: VIRIN: 226915-T-EXQ95-628.jpg Photo Gallery