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Application filed by Pentti Armas VirtanenfiledCriticalPentti Armas Virtanen
Priority to FI881817ApriorityCriticalpatent/FI83263C/fi
Publication of FI881817A0publicationCriticalpatent/FI881817A0/fi
Publication of FI881817ApublicationCriticalpatent/FI881817A/fi
Publication of FI83263BpublicationCriticalpatent/FI83263B/fi
Application grantedgrantedCritical
Publication of FI83263CpublicationCriticalpatent/FI83263C/fi