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Application filed by Н.Н. Дрозин, Т.С. ФилипповfiledCriticalН.Н. Дрозин
Priority to SU39791ApriorityCriticalpatent/SU72204A1/ru
Application grantedgrantedCritical
Publication of SU72204A1publicationCriticalpatent/SU72204A1/ru