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 DD17950174ApriorityCriticalpatent/DD112703A1/xx
Publication of DD112703A1publicationCriticalpatent/DD112703A1/xx
Priority to SU752145948Aprioritypatent/SU645267A1/ru