Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Martti Antero VirtanenfiledCriticalMartti Antero Virtanen
Priority to FI820506ApriorityCriticalpatent/FI78142C/fi
Publication of FI820506LpublicationCriticalpatent/FI820506L/fi
Publication of FI78142BpublicationCriticalpatent/FI78142B/fi
Application grantedgrantedCritical
Publication of FI78142CpublicationCriticalpatent/FI78142C/fi