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Publication of SU402248A1publicationCriticalpatent/SU402248A1/en
Application filed by С.Я. СоколовfiledCriticalС.Я. Соколов
Priority to SU29313ApriorityCriticalpatent/SU18829A1/en
Application grantedgrantedCritical
Publication of SU18829A1publicationCriticalpatent/SU18829A1/en