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Application filed by Г.Б. Зильберман, М.А. СлободникfiledCriticalГ.Б. Зильберман
Priority to SU193300ApriorityCriticalpatent/SU48285A1/en
Application grantedgrantedCritical
Publication of SU48285A1publicationCriticalpatent/SU48285A1/en