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Application filed by Svein NordtvedtfiledCriticalSvein Nordtvedt
Priority to NO812607ApriorityCriticalpatent/NO149760C/no
Publication of NO812607LpublicationCriticalpatent/NO812607L/no
Publication of NO149760BpublicationCriticalpatent/NO149760B/no
Publication of NO149760CpublicationCriticalpatent/NO149760C/no