council decis april conclus intern convent harmon commod descript code system protocol amend thereto eec council european commun regard treati establish european econom commun articl thereof regard propos commiss regard opinion european parliament custom cooper council plenari session june adopt intern convent harmon commod descript code system purpos convent facilit intern trade collect comparison analysi statist applic trade convent intend replac intern basi custom tariff statist nomenclatur convent nomenclatur sign brussel decemb basi common custom tariff nimex convent sign behalf commun subject accept june protocol amend convent adopt custom cooper council june desir instrument accept protocol deposit time instrument accept intern convent harmon system commun propos appli harmon system januari essenti interest commun acced convent import countri engag intern trade decid articl intern convent harmon commod descript code system brussel june protocol amend thereto brussel june approv behalf commun oj oj text convent protocol amend thereto attach decis articl decis prejudic posit commun negoti adopt revis schedul tariff concess base harmon system negoti continu conduct strict accord specif guidelin agre gatt aim secur neutral transposit tariff schedul articl presid council author design person empow deposit instrument accept behalf commun luxembourg april council presid ph maystadt date entri forc convent protocol amend thereto publish offici journal european commun gener secretariat council