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Application filed by Axel Bertil Elof EngquistfiledCriticalAxel Bertil Elof Engquist
Priority to FI581/74ApriorityCriticalpatent/FI53868C/fi
Publication of FI58174A7publicationCriticalpatent/FI58174A7/fi
Publication of FI53868BpublicationCriticalpatent/FI53868B/fi
Application grantedgrantedCritical
Publication of FI53868CpublicationCriticalpatent/FI53868C/fi