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Application filed by Walter NilsenfiledCriticalWalter Nilsen
Priority to NO772323ApriorityCriticalpatent/NO143481C/no
Publication of NO772323LpublicationCriticalpatent/NO772323L/no
Publication of NO143481BpublicationCriticalpatent/NO143481B/no
Publication of NO143481CpublicationCriticalpatent/NO143481C/no