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Application filed by И.И. Китайгородский, Г.А. СтепановfiledCriticalИ.И. Китайгородский
Priority to SU393619ApriorityCriticalpatent/SU78331A2/en
Application grantedgrantedCritical
Publication of SU78331A2publicationCriticalpatent/SU78331A2/en