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Application filed by М.И. Пекшибаев, М.А. ФотеровfiledCriticalМ.И. Пекшибаев
Priority to SU169227ApriorityCriticalpatent/SU49201A1/en
Application grantedgrantedCritical
Publication of SU49201A1publicationCriticalpatent/SU49201A1/en