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Priority claimed from GB878705780Aexternal-prioritypatent/GB8705780D0/en
Publication of NO921423LpublicationCriticalpatent/NO921423L/en
Application filed by Norsk Hydro AsfiledCriticalNorsk Hydro As
Priority to NO921423ApriorityCriticalpatent/NO172042C/en
Publication of NO921423D0publicationCriticalpatent/NO921423D0/en
Publication of NO172042BpublicationCriticalpatent/NO172042B/en
Publication of NO172042CpublicationCriticalpatent/NO172042C/en