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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Publication date
Application filed by Б.П. Кушелевский, И.Я. ПостовскийfiledCriticalБ.П. Кушелевский
Priority to SU4670ApriorityCriticalpatent/SU64220A1/ru
Application grantedgrantedCritical
Publication of SU64220A1publicationCriticalpatent/SU64220A1/ru