council decis decemb conclus european econom commun agreement form exchang letter extens durat interim agreement trade trade relat measur european econom commun european coal steel commun part republ poland part eec council european commun regard treati establish european econom commun articl thereof regard propos commiss regard opinion european parliament pend complet ratif procedur europ agreement establish associ european commun member state part republ poland part sign brussel decemb extend decemb durat interim agreement trade trade relat measur european econom commun european coal steel commun part republ poland part sign brussel decemb conclud agreement form exchang letter decid articl agreement form exchang letter extens durat interim agreement trade trade relat measur european econom commun european coal steel commun part republ poland part approv behalf european econom commun text agreement attach decis articl presid council author design person sign agreement order bind commun brussel decemb council presid hurd oj oj