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Priority claimed from NO493/71Aexternal-prioritypatent/NO127044C/no
Application filed by Fernholt & GiertsenfiledCriticalFernholt & Giertsen
Priority to NO429172ApriorityCriticalpatent/NO131452C/no
Publication of NO131452BpublicationCriticalpatent/NO131452B/no
Publication of NO131452CpublicationCriticalpatent/NO131452C/no