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
Priority to DEM41482ApriorityCriticalpatent/DE1189108B/de
Priority to GB34980/64Aprioritypatent/GB1031974A/en
Priority to FR986621Aprioritypatent/FR1405200A/fr
Application filedfiledCritical
Priority to BE652479Aprioritypatent/BE652479A/xx
Publication of BE652479ApublicationCriticalpatent/BE652479A/xx