++++ COMMON CUSTOMS TARIFF - EXEMPTION FROM IMPORT DUTIES - SCIENTIFIC INSTRUMENTS AND APPARATUS - APPRAISAL OF SCIENTIFIC CHARACTER - PROCEDURE - RIGHT OF THE PERSON SEEKING EXEMPTION TO BE HEARD - NONE ( COUNCIL REGULATION NO 918/83, ARTS 50 TO 59; COMMISSION REGULATION NO 2290/83, ART . 7 ( 2 ) TO ( 7 ))