1 . PRELIMINARY QUESTIONS - ASSESSMENT OF VALIDITY - COMMISSION DECISION DECLARING THAT GOODS MAY NOT BE IMPORTED FREE OF COMMON CUSTOMS TARIFF DUTIES - SUBSEQUENT REJECTION BY THE NATIONAL AUTHORITY OF THE APPLICATION FOR DUTY-FREE ADMISSION - OBJECTION ALLEGING THE ILLEGALITY OF THE COMMISSION DECISION RAISED IN PROCEEDINGS BEFORE THE NATIONAL COURTS BROUGHT AGAINST THE DECISION TO REJECT THE APPLICATION - FAILURE TO BRING AN ACTION FOR ANNULMENT UNDER THE SECOND PARAGRAPH OF ART . 173 OF THE TREATY AGAINST THE COMMISSION DECISION - NO EFFECT ON THE ADMISSIBILITY OF THE OBJECTION OF ILLEGALITY ( EEC TREATY , SECOND PARA . OF ART . 173 , ARTS 177 AND 184 ; REGULATION NO 3195/75 OF THE COMMISSION , ART . 4 ( 6 )) 2 . PRELIMINARY QUESTIONS - ASSESSMENT OF VALIDITY - REVIEW BY THE COURT - LIMITS - COMMISSION DECISION DECLARING THAT GOODS MAY NOT BE IMPORTED FREE OF COMMON CUSTOMS TARIFF DUTIES - OBJECTS OF SCIENTIFIC VALUE - CONFORMITY OF THE DECISION WITH THE OPINION OF THE COMMITTEE ON DUTY-FREE ARRANGEMENTS ON THE QUESTION WHETHER THE IMPORTED INSTRUMENT AND OTHER INSTRUMENTS MADE IN THE COMMUNITY ARE EQUIVALENT - REVIEW BY THE COURT LIMITED TO MANIFEST ERROR AND MISUSE OF POWER ( REGULATION NO 3195/75 OF THE COMMISSION , ART . 4 ) 3 . COMMON CUSTOMS TARIFF - IMPORTATION FREE OF CUSTOMS DUTIES - OBJECTS OF SCIENTIFIC VALUE - WHETHER THE IMPORTED PRODUCT AND OTHER INSTRUMENTS MADE IN THE COMMUNITY ARE EQUIVALENT - ASSESSMENT - CRITERIA ( REGULATION NO 1798/75 OF THE COUNCIL , ART . 3 ( 3 ))