1 . SOCIAL SECURITY FOR MIGRANT WORKERS - BENEFITS - NATIONAL RULES AGAINST OVERLAPPING - WHETHER APPLICABLE TO BENEFITS ACQUIRED BY VIRTUE OF NATIONAL LEGISLATION ALONE ( REGULATION NO 1408/71 OF THE COUNCIL , ARTS 12 ( 2 ) AND 46 ) 2 . SOCIAL SECURITY FOR MIGRANT WORKERS - INVALIDITY INSURANCE - CALCULATION OF BENEFITS - ARTICLE 46 OF REGULATION NO 1408/71 - WHETHER APPLICABLE WHEN THE AMOUNT OF THE BENEFITS DUE BY VIRTUE OF NATIONAL LEGISLATION IS UNRELATED TO THE PERIODS COMPLETED AND WHEN THE MINIMUM PERIOD UNDER THAT LEGISLATION WAS COMPLETED IN A SPECIAL SCHEME FOR A PARTICULAR OCCUPATION - RULES FOR CALCULATING THE BENEFITS .
( REGULATION NO 1408/71 OF THE COUNCIL , ARTS 45 ( 2 ) AND 46 )