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.Н. ШашковfiledCriticalА.Н. Шашков
Priority to SU160ApriorityCriticalpatent/SU74221A1/ru
Application grantedgrantedCritical
Publication of SU74221A1publicationCriticalpatent/SU74221A1/ru