decis repres govern member state meet council march uniform applic custom nomenclatur regard product fall provinc ecsc treati ecsc repres govern member state european coal steel commun meet council sake simplic uniform order ensur uniform applic custom nomenclatur mean establish product fall provinc ecsc treati subject provis product fall provinc eec treati agreement commiss decid articl commun provis ensur uniform applic nomenclatur common custom tariff appli product fall provinc ecsc treati articl member state measur implement decis brussel march presid van eekelem