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Application filed by Я.А. Мандельбаум, Н.Н. МельниковfiledCriticalЯ.А. Мандельбаум
Priority to SU396109ApriorityCriticalpatent/SU77101A1/ru
Application grantedgrantedCritical
Publication of SU77101A1publicationCriticalpatent/SU77101A1/ru