HELSINKI, Sept 4 (Reuters) - Finnish refiner Neste Oil said on Thursday it had appointed Matti Lievonen as a chief executive as of Dec. 1, replacing Risto Rinne who will leave his post for health reasons and retire. Lievonen, 49, joins Neste Oil from paper maker UPM-Kymmene , where he has been the president of the fine and speciality paper division. 'His (Lievonen's) strong...
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