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 И.Н. СапгирfiledCriticalИ.Н. Сапгир
Priority to SU386897ApriorityCriticalpatent/SU76836A2/en
Application grantedgrantedCritical
Publication of SU76836A2publicationCriticalpatent/SU76836A2/en