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.)
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Application filed by Н.П. Кузьмин, В.К. Цысковский, А.И. ШпакfiledCriticalН.П. Кузьмин
Priority to SU16ApriorityCriticalpatent/SU66311A1/ru
Application grantedgrantedCritical
Publication of SU66311A1publicationCriticalpatent/SU66311A1/ru