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Application filed by П.Я. Коротков, К.И. Трушин, Я.М. ЯровинскийfiledCriticalП.Я. Коротков
Priority to SU564321ApriorityCriticalpatent/SU117625A1/en
Application grantedgrantedCritical
Publication of SU117625A1publicationCriticalpatent/SU117625A1/en