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Publication date
Application filed by Sigurd Heien, Alf LoevikfiledCriticalSigurd Heien
Priority to NO813298ApriorityCriticalpatent/NO148423C/no
Publication of NO813298LpublicationCriticalpatent/NO813298L/no
Publication of NO148423BpublicationCriticalpatent/NO148423B/no
Publication of NO148423CpublicationCriticalpatent/NO148423C/no