++++ 1 . PROCEDURE - PRELIMINARY RULING - JURISDICTION OF THE COURT - LIMITS ( EEC TREATY, ARTICLE 177 ) 2 . FREE MOVEMENT OF PERSONS - MIGRANT WORKERS - INSURANCE - BENEFITS - PROPORTIONAL CALCULATION AS A COROLLARY OF AGGREGATION ( EEC TREATY, ARTICLE 51 ) 3 . FREE MOVEMENT OF PERSONS - MIGRANT WORKERS - INSURANCE - SYSTEM PROVIDED FOR BY REGULATION NO 3 - RETENTION OF SEPARATE NATIONAL SYSTEMS AND OF SEPARATE CLAIMS 4 . FREE MOVEMENT OF PERSONS - MIGRANT WORKERS - OLD-AGE AND DEATH ( PENSIONS ) INSURANCE - PENSION RIGHTS RELATING TO SEPARATE PERIODS - ABSENCE OF IMPROPER ACCUMULATION ( EEC TREATY, ARTICLE 51; REGULATION NO 3, ARTICLES 27 AND 28 )