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.)
Publication of NL292692ApublicationCriticalpatent/NL292692A/xx
Priority claimed from US126747Aexternal-prioritypatent/US3148620A/en
Priority claimed from US153299Aexternal-prioritypatent/US3204558A/en
