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.)
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Priority claimed from FI2879/74Aexternal-prioritypatent/FI55576C/en
Application filed by Helvar OyfiledCriticalHelvar Oy
Priority to FI791438ApriorityCriticalpatent/FI791438A/en
Publication of FI791438ApublicationCriticalpatent/FI791438A/en