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Application filed by В. И. Редькин и А. Н. ТетиорfiledCriticalВ. И. Редькин и А. Н. Тетиор
Priority to SU772493121ApriorityCriticalpatent/SU670687A2/ru
Application grantedgrantedCritical
Publication of SU670687A2publicationCriticalpatent/SU670687A2/ru