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 Karl Bengt Trehn, Nils Henrik SwahnfiledCriticalKarl Bengt Trehn
Priority to MX17810979ApriorityCriticalpatent/MX148700A/es
Publication of MX148700ApublicationCriticalpatent/MX148700A/es