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Application filed by Н.Б. Борисов, Г.З. ЦифриновичfiledCriticalН.Б. Борисов
Priority to SU178400ApriorityCriticalpatent/SU47802A1/ru
Application grantedgrantedCritical
Publication of SU47802A1publicationCriticalpatent/SU47802A1/ru