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Application filed by А.Е. Гелих, Н.А. ЛоханинfiledCriticalА.Е. Гелих
Priority to SU68520ApriorityCriticalpatent/SU24059A1/en
Application grantedgrantedCritical
Publication of SU24059A1publicationCriticalpatent/SU24059A1/en