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 filed by Э.И. ПетровfiledCriticalЭ.И. Петров
Priority to SU56640ApriorityCriticalpatent/SU19350A1/ru
Application grantedgrantedCritical
Publication of SU19350A1publicationCriticalpatent/SU19350A1/ru