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 DD18339874ApriorityCriticalpatent/DD116804A1/xx
Priority to DE19752552264prioritypatent/DE2552264A1/de
Priority to CS812575Aprioritypatent/CS175305B1/cs
Publication of DD116804A1publicationCriticalpatent/DD116804A1/xx