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Application filed by П.Н. Бабочкин, Г.А. КанfiledCriticalП.Н. Бабочкин
Priority to SU4694ApriorityCriticalpatent/SU75265A1/ru
Application grantedgrantedCritical
Publication of SU75265A1publicationCriticalpatent/SU75265A1/ru