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Application filed by В.М. ВарютинfiledCriticalВ.М. Варютин
Priority to SU69457ApriorityCriticalpatent/SU21192A1/en
Priority claimed from SU69457Aexternal-prioritypatent/SU21192A1/en
Application grantedgrantedCritical
Publication of SU21191A1publicationCriticalpatent/SU21191A1/en
Publication of SU21192A1publicationCriticalpatent/SU21192A1/en