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Application filed by Erkki Tapio TuhkanenfiledCriticalErkki Tapio Tuhkanen
Priority to FI801417ApriorityCriticalpatent/FI61658C/fi
Publication of FI801417ApublicationCriticalpatent/FI801417A/fi
Application grantedgrantedCritical
Publication of FI61658BpublicationCriticalpatent/FI61658B/fi
Publication of FI61658CpublicationCriticalpatent/FI61658C/fi