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Application filed by В. М. Небратов , А. А. ШейманfiledCriticalВ. М. Небратов , А. А. Шейман
Priority to SU1861646ApriorityCriticalpatent/SU429501A1/ru
Application grantedgrantedCritical
Publication of SU429501A1publicationCriticalpatent/SU429501A1/ru