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Application filed by В. Н. Ткачев , Б. И. АвиловfiledCriticalВ. Н. Ткачев , Б. И. Авилов
Priority to SU1479489ApriorityCriticalpatent/SU358408A1/ru
Application grantedgrantedCritical
Publication of SU358408A1publicationCriticalpatent/SU358408A1/ru