1 . SOCIAL SECURITY FOR MIGRANT WORKERS - BENEFITS - NATIONAL RULES TO PREVENT OVERLAPPING - ARTICLE 12 ( 2 ) OF REGULATION NO 1408/71 - PURPOSE - APPLICABLE ONLY TO BENEFITS ACQUIRED UPON APPLICATION OF REGULATION NO 1408/71 ( EEC TREATY , ARTS 48 TO 51 ; REGULATION NO 1408/71 OF THE COUNCIL , ART . 12 ( 2 )) 2.SOCIAL SECURITY FOR MIGRANT WORKERS - BENEFITS - NATIONAL RULES TO PREVENT OVERLAPPING - NOT APPLICABLE TO BENEFITS ACQUIRED UNDER THE LEGISLATION OF A SINGLE MEMBER STATE - BENEFITS AWARDED AND FINANCED ON THE CONDITIONS LAID DOWN IN ARTICLE 57 OF REGULATION NO 1408/71 - NO EFFECT ( REGULATION NO 1408/71 OF THE COUNCIL , FIRST SENTENCE OF ART . 12 ( 2 ) AND ART . 57 )