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Priority claimed from SE8603903Aexternal-prioritypatent/SE454564B/en
Application filed by Bergmark Nils RfiledCriticalBergmark Nils R
Publication of NO882121D0publicationCriticalpatent/NO882121D0/en
Publication of NO882121LpublicationCriticalpatent/NO882121L/en
Publication of NO165624BpublicationCriticalpatent/NO165624B/en
Publication of NO165624CpublicationCriticalpatent/NO165624C/en