COMMON CUSTOMS TARIFF - DUTY-FREE ADMISSION ON IMPORTATION - SCIENTIFIC INSTRUMENTS AND APPARATUS - ASSESSMENT OF SCIENTIFIC CHARACTER - CRITERIA ( REGULATION ( EEC ) NO 1798/75 OF THE COUNCIL , ART . 3 ( 1 ) AND ( 3 ), AS AMENDED BY REGULATION ( EEC ) NO 1027/79 ; COMMISSION REGULATION ( EEC ) NO 2784/79 , ART . 5 ( 1 ))