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EUR-Lex -  61992CJ0039 - EN - Judgment of the Court (First Chamber) of 10 November 1993. - Petróleos de Portugal - Petrogal SA v Correia Simões & CO. Ldª et Correia Sousa & Crisóstomo Ldª. - Reference for a preliminary ruling: Tribunal Cível da Comarca de Lisboa - Portugal. - Competition - Block exemption - Exclusive purchasing agreement - Duration of the agreement - Whether void - Effects. - Case C-39/92.