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Application filed by Erkki Johannes NiskanenfiledCriticalErkki Johannes Niskanen
Priority to FI820950ApriorityCriticalpatent/FI65500C/fi
Publication of FI820950LpublicationCriticalpatent/FI820950L/fi
Publication of FI65500BpublicationCriticalpatent/FI65500B/fi
Application grantedgrantedCritical
Publication of FI65500CpublicationCriticalpatent/FI65500C/fi