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Application filed by Magnus BirkelandfiledCriticalMagnus Birkeland
Priority to NO751674ApriorityCriticalpatent/NO139316C/no
Publication of NO751674LpublicationCriticalpatent/NO751674L/no
Publication of NO139316BpublicationCriticalpatent/NO139316B/no
Publication of NO139316CpublicationCriticalpatent/NO139316C/no