SOCIAL SECURITY FOR MIGRANT WORKERS - INSURANCE COVERING OLD AGE AND DEATH - AGGREGATION OF PERIODS OF INSURANCE - PERIODS OF LESS THAN A YEAR COMPLETED UNDER THE LEGISLATION OF ANOTHER MEMBER STATE - TAKING INTO ACCOUNT OF SUCH PERIODS - REQUIREMENT BY THE COMPETENT MEMBER STATE OF CONTRIBUTIONS CORRESPONDING TO SUCH PERIODS - NOT PERMITTED ( REGULATION NO 1408/71 OF THE COUNCIL ART . 48 ( 2 ))