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Application filed by М.А. Ильинский, Р.М. ШпинельfiledCriticalМ.А. Ильинский
Priority to SU18724ApriorityCriticalpatent/SU8972A1/ru
Application grantedgrantedCritical
Publication of SU8972A1publicationCriticalpatent/SU8972A1/ru