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Application filed by Helge Kullervo KetolainenfiledCriticalHelge Kullervo Ketolainen
Priority to FI249674ApriorityCriticalpatent/FI51855C/fi
Publication of FI249674ApublicationCriticalpatent/FI249674A/fi
Publication of FI51855BpublicationCriticalpatent/FI51855B/fi
Application grantedgrantedCritical
Publication of FI51855CpublicationCriticalpatent/FI51855C/fi