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 И.Г. КалининfiledCriticalИ.Г. Калинин
Priority to SU6001ApriorityCriticalpatent/SU71179A1/ru
Application grantedgrantedCritical
Publication of SU71179A1publicationCriticalpatent/SU71179A1/ru