1 . SOCIAL SECURITY FOR MIGRANT WORKERS - ' ' PRESENT OR FUTURE ' ' NATIONAL LAWS AND RULES WITHIN THE MEANING OF ARTICLE 1 ( J ) OF REGULATION NO 1408/71 - CONCEPT - PROVISIONS IN FORCE BEFORE THE ADOPTION OF THE COMMUNITY REGULATIONS - EXCLUSION NOT PERMISSIBLE 2 . SOCIAL SECURITY FOR MIGRANT WORKERS - INVALIDITY INSURANCE - ASSESSMENT OF BENEFITS - PERIODS COMPLETED IN THE NETHERLANDS BEFORE 1 JULY 1967 - PERIODS TO BE REGARDED AS PERIODS OF INSURANCE AND NOT AS PERIODS TREATED AS SUCH ( REGULATION NO 1408/71 OF THE COUNCIL , ART . 46 AND PARA . 4 OF PART H OF ANNEX V , AND REGULATION NO 574/72 OF THE COUNCIL , ART . 15 )