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EUR-Lex -  61989CC0185 - EN - Opinion of Mr Advocate General Lenz delivered on 2 May 1990. - Staatssecretaris van Financiën v Velker International Oil Company Ltd NV. - Reference for a preliminary ruling: Hoge Raad - Netherlands. - VAT - Sixth directive relating to turnover taxes - Exemption. - Case C-185/89.