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
Publication of SU402229A1publicationCriticalpatent/SU402229A1/ru
Priority claimed from DE19702023521external-prioritypatent/DE2023521C3/de
Application filedfiledCritical
Application grantedgrantedCritical
Publication of SU402229A3publicationCriticalpatent/SU402229A3/ru