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EUR-Lex -  61987CC0083 - EN - Opinion of Mr Advocate General Darmon delivered on 9 March 1988. - Mario Viva v Fonds national de retraite des ouvriers mineurs (FNROM). - Reference for a preliminary ruling: Cour du travail de Mons - Belgium. - Social security - Review of pension rights acquired by an insured person before the entry into force of Regulation Nº 1408/71. - Case 83/87.