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 claimed from DE19681811337external-prioritypatent/DE1811337C3/de
Application filedfiledCritical
Publication of NL6917950ApublicationCriticalpatent/NL6917950A/xx