decis repres govern member state april provision locat court auditor eec euratom ecsc repres govern member state regard treati establish singl council singl commiss european commun articl thereof regard decis repres govern member state april provision locat institut depart commun articl thereof regard opinion commiss prejudic applic articl treati establish european coal steel commun articl treati establish european econom commun articl treati establish european atom energi commun make arrang provision place work court auditor set treati juli amend financi provis treati establish european commun treati establish singl council singl commiss european commun decid articl court auditor locat luxembourg provision place work mean decis repres govern member state april provision locat institut depart commun articl decis enter forc date treati juli amend financi provis treati establish european commun treati establish singl council singl commiss european commun luxembourg april presid owen oj