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Application filed by М.Г. Черняк, к М.Г. ЧернfiledCriticalМ.Г. Черняк
Priority to SU380869ApriorityCriticalpatent/SU79005A1/ru
Application grantedgrantedCritical
Publication of SU79005A1publicationCriticalpatent/SU79005A1/ru