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EUR-Lex -  61993CC0301 - EN - Opinion of Mr Advocate General Jacobs delivered on 14 April 1994. - Lio Bettaccini v Fonds National de Retraite des Ouvriers Mineurs. - Reference for a preliminary ruling: Tribunal du travail de Mons - Belgium. - Social security for migrant workers - Increase in invalidity pension - Application of national rules against overlapping of benefits. - Case C-301/93.