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Application filed by И.И. Грядасов, дасов И.И. ГрfiledCriticalИ.И. Грядасов
Priority to SU123964ApriorityCriticalpatent/SU32944A1/en
Application grantedgrantedCritical
Publication of SU32944A1publicationCriticalpatent/SU32944A1/en