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EUR-Lex -  61988CC0021 - EN - Opinion of Mr Advocate General Lenz delivered on 28 November 1989. - Du Pont de Nemours Italiana SpA v Unità sanitaria locale Nº 2 di Carrara. - Reference for a preliminary ruling: Tribunale amministrativo regionale della Toscana - Italia. - Public supply contracts - Reservation of 30 % of such contracts to undertakings located in a particular region. - Case C-21/88.