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Application filed by Risto Kalevi TuhkanenfiledCriticalRisto Kalevi Tuhkanen
Priority to FI893097ApriorityCriticalpatent/FI893097A/fi
Publication of FI893097A0publicationCriticalpatent/FI893097A0/fi
Publication of FI893097ApublicationCriticalpatent/FI893097A/fi