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Application filed by А.Н. Аренсберг, В.А. ЛепетовfiledCriticalА.Н. Аренсберг
Priority to SU55504ApriorityCriticalpatent/SU23610A1/ru
Application grantedgrantedCritical
Publication of SU23610A1publicationCriticalpatent/SU23610A1/ru