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 CH449265DpriorityCriticalpatent/CH449265A/de
Priority to DE19651570994prioritypatent/DE1570994A1/de
Application filedfiledCritical
Priority to BE669436Aprioritypatent/BE669436A/xx
Priority to FR33737Aprioritypatent/FR1449263A/fr
Publication of BE669436ApublicationCriticalpatent/BE669436A/xx
