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 SU1282027Aexternal-prioritypatent/SU315358A1/ru
Priority claimed from CH1541867Aexternal-prioritypatent/CH504473A/de
Application filedfiledCritical
Application grantedgrantedCritical
Publication of SU361572A3publicationCriticalpatent/SU361572A3/ru