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Application filed by П.А. Гангрский, В.В. ИгнатьевfiledCriticalП.А. Гангрский
Priority to SU384075ApriorityCriticalpatent/SU76631A1/ru
Application grantedgrantedCritical
Publication of SU76631A1publicationCriticalpatent/SU76631A1/ru