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 П.А. Коробков, И.И. ТуговfiledCriticalП.А. Коробков
Priority to SU4788ApriorityCriticalpatent/SU71868A1/en
Application grantedgrantedCritical
Publication of SU71868A1publicationCriticalpatent/SU71868A1/en