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Application filed by Г.М. Николаев, П.Х. ОтченашенкоfiledCriticalГ.М. Николаев
Priority to SU68310ApriorityCriticalpatent/SU20420A1/en
Application grantedgrantedCritical
Publication of SU20420A1publicationCriticalpatent/SU20420A1/en