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Application filed by Helvar OyfiledCriticalHelvar Oy
Priority to FI2038/74ApriorityCriticalpatent/FI53380C/fi
Publication of FI203874A7publicationCriticalpatent/FI203874A7/fi
Publication of FI53380BpublicationCriticalpatent/FI53380B/fi
Application grantedgrantedCritical
Publication of FI53380CpublicationCriticalpatent/FI53380C/fi