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EUR-Lex -  61990CC0177 - EN - Opinion of Mr Advocate General Mischo delivered on 26 September 1991. - Ralf-Herbert Kühn v Landwirtschaftskammer Weser-Ems. - Reference for a preliminary ruling: Niedersächsisches Oberverwaltungsgericht - Germany. - Additional levy on milk. - Case C-177/90.