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Application filed by В.Ф. БерезкинfiledCriticalВ.Ф. Березкин
Priority to SU2819243/06ApriorityCriticalpatent/SU799563A1/en
Application grantedgrantedCritical
Publication of RU799563CpublicationCriticalpatent/RU799563C/en
Publication of SU799563A1publicationCriticalpatent/SU799563A1/en