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 NL133608CpublicationCriticalpatent/NL133608C/xx
Priority claimed from US810303Aexternal-prioritypatent/US3048254A/en
Priority claimed from FR850447Aexternal-prioritypatent/FR1287416A/fr