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 CS539870ApriorityCriticalpatent/CS148556B1/cs
Priority to DE19712137564prioritypatent/DE2137564A1/de
Priority to GB3621571Aprioritypatent/GB1329773A/en
Publication of CS148556B1publicationCriticalpatent/CS148556B1/cs