council decis june accept custom cooper council recommend june amend nomenclatur classif good custom tariff eec council european commun regard treati establish european econom commun articl thereof regard recommend commiss member state contract parti brussel convent decemb nomenclatur classif good custom tariff common custom tariff base nomenclatur custom cooper council recommend contract parti amend convent nomenclatur form part thereof june council issu recommend amend nomenclatur convent belgian ministri foreign affair commun text draft recommend amend contract parti govern signatori acced state text deem accept encount object contract parti month date commun object encount amend enter forc month expiri period custom tariff contract parti align amend nomenclatur end period belgian ministri foreign affair commun text recommend june contract parti decemb effect decemb recommend deem accept juli encount object part object made part recommend decid sole articl custom cooper council recommend june amend nomenclatur classif good custom tariff accept applic januari luxembourg june council presid benn