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Application filed by Г.А. Кирхгоф, З.Н. СыркинfiledCriticalГ.А. Кирхгоф
Priority to SU62934ApriorityCriticalpatent/SU23412A1/ru
Application grantedgrantedCritical
Publication of SU23412A1publicationCriticalpatent/SU23412A1/ru