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Application filed by Н.Г. Грузов, Н.Н. ГрузовfiledCriticalН.Г. Грузов
Priority to SU75747ApriorityCriticalpatent/SU2298A1/en
Application grantedgrantedCritical
Publication of SU2298A1publicationCriticalpatent/SU2298A1/en