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
Application filedfiledCritical
Priority to DD16613872ApriorityCriticalpatent/DD109959A1/xx
Priority to DE19732347421prioritypatent/DE2347421A1/de
Priority to FR7334898Aprioritypatent/FR2209161B1/fr
Publication of DD109959A1publicationCriticalpatent/DD109959A1/xx