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Application filed by Erling BirkelandfiledCriticalErling Birkeland
Priority to NO840746ApriorityCriticalpatent/NO154099C/no
Publication of NO840746LpublicationCriticalpatent/NO840746L/no
Publication of NO154099BpublicationCriticalpatent/NO154099B/no
Publication of NO154099CpublicationCriticalpatent/NO154099C/no