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 E O Bergmark, Swerd K GfiledCriticalE O Bergmark
Priority to SE7308306ApriorityCriticalpatent/SE380970B/sv
Publication of SE7308306LpublicationCriticalpatent/SE7308306L/xx
Publication of SE380970BpublicationCriticalpatent/SE380970B/sv