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 А.В. СмирновfiledCriticalА.В. Смирнов
Priority to SU237ApriorityCriticalpatent/SU72061A1/en
Application grantedgrantedCritical
Publication of SU72061A1publicationCriticalpatent/SU72061A1/en