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Application filed by Б.Г. Ефимов, Г.Е. ЕфимовfiledCriticalБ.Г. Ефимов
Priority to SU98156ApriorityCriticalpatent/SU34731A1/en
Application grantedgrantedCritical
Publication of SU34731A1publicationCriticalpatent/SU34731A1/en