council regul eec septemb conclus agreement form exchang letter amend agreement european econom commun swiss confeder purpos adjust tariff specif council european commun regard treati establish european econom commun articl thereof regard recommend commiss consequ amend result recommend custom cooper council june autonom common custom tariff swiss custom tariff tariff specif agreement european econom commun swiss confeder adjust amend agreement refer order establish simplifi procedur adjust tariff specif event amend tariff contract parti adopt regul articl agreement form exchang letter amend agreement european econom commun swiss confeder approv behalf commun text agreement annex regul articl presid council author design person empow sign agreement order bind commun articl regul enter forc dai public offici journal european commun appli effect januari regul bind entireti directli applic member state brussel septemb council presid genscher oj