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 Helvar OyfiledCriticalHelvar Oy
Priority to FI362472ApriorityCriticalpatent/FI48652C/fi
Publication of FI48652BpublicationCriticalpatent/FI48652B/fi
Application grantedgrantedCritical
Publication of FI48652CpublicationCriticalpatent/FI48652C/fi