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Application filed by Ф.Ф. Воскресенский, С.Д. ТавасиевfiledCriticalФ.Ф. Воскресенский
Priority to SU378892ApriorityCriticalpatent/SU75864A1/en
Application grantedgrantedCritical
Publication of SU75864A1publicationCriticalpatent/SU75864A1/en