council decis decemb approv agreement form exchang letter commun efta countri grant tariff prefer generalis system prefer norwai switzerland provid good content norwegian swiss origin treat arriv custom territori commun good content commun origin reciproc agreement ec council european union regard treati establish european commun articl thereof regard articl commiss regul eec juli lai provis implement council regul eec establish commun custom code enabl commun swiss norwegian custom author issu replac form certif origin order facilit movement good origin develop countri benefit generalis prefer grant european commun switzerland norwai agreement conclud commun switzerland norwai mutual recognis compon origin develop countri concern bilater cumul origin rule mandat council commiss march negoti effect place european commun switzerland norwai led agreement form exchang letter commun interest approv decid articl agreement form exchang letter commun efta countri grant tariff prefer gsp norwai switzerland provid good origin norwai switzerland treat arriv custom territori commun good content commun origin reciproc agreement approv behalf commun text agreement form exchang letter attach decis articl presid council authoris design person authoris sign agreement form exchang letter order bind commun articl presid council behalf commun give notif provid agreement form exchang letter brussel decemb council presid pierret oj regul amend regul ec oj