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EUR-Lex -  61989CJ0109 - EN - Judgment of the Court (Third Chamber) of 5 April 1990. - Office national des pensions v Ernesto Bianchin. - Reference for a preliminary ruling: Cour du travail de Liège - Belgium. - Social security for migrant workers - Regulation (EEC) Nº 1408/71 - Belgian social security legislation. - Case C-109/89.