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Application filed by И.Л. Андреевский, А.А. Гельрих, Б.В. ТроицкийfiledCriticalИ.Л. Андреевский
Priority to SU197982ApriorityCriticalpatent/SU51089A1/en
Application grantedgrantedCritical
Publication of SU51089A1publicationCriticalpatent/SU51089A1/en