EUROPEAN COMMON MARKET TREATIES SIGNED: ROME : Taking a historic step towards political unity, statesmen of six european nations sign their names to treaties setting up a european common market and atom pool, during the ceremony in Rome's Campidoglio City Hall. Shown left to right are : M. Paul Henri Spaak Belgian foreign minister, an aide; M. Christian Pineau French Foreign Minister; M, Maurice Faure, French Minister of state for foreign affairs; Dr Konrad Adenauer West German Chancellor; Mr Hallstein of West Germany; and Italian Premier Antonio Segni.