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Application filed by В.В. Чернов, П.Н. ШаблыкинfiledCriticalВ.В. Чернов
Priority to SU147699ApriorityCriticalpatent/SU39118A1/en
Application grantedgrantedCritical
Publication of SU39118A1publicationCriticalpatent/SU39118A1/en