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Application filed by А.Д. Бахтин, А.А. БрюшковfiledCriticalА.Д. Бахтин
Priority to SU138670ApriorityCriticalpatent/SU37985A1/ru
Application grantedgrantedCritical
Publication of SU37985A1publicationCriticalpatent/SU37985A1/ru