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Application filed by В.Ф. Бутяга, га В.Ф. БутfiledCriticalВ.Ф. Бутяга
Priority to SU406ApriorityCriticalpatent/SU74106A1/en
Application grantedgrantedCritical
Publication of SU74106A1publicationCriticalpatent/SU74106A1/en