commiss decis decemb conlus behalf european coal steel commun agreement form exchang letter european coal steel commun european econom commun part republ poland part extend durat interim agreement sign parti brussel decemb ecsc commiss european commun regard treati establish european coal steel commun paragraph articl thereof pend complet ratif procedur europ agreement sign brussel decemb extend decemb durat interim agreement sign brussel decemb conclud agreement form exchang letter consult consult committe unanim assent council decid articl agreement form exchang letter extens decemb durat interim agreement sign brussel decemb european coal steel commun european econom commun part republ poland part approv behalf european coal steel commun text agreement annex decis articl presid commiss author design person sign agreement order bind commiss brussel decemb council presid jacqu delor page offici journal