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Application filed by Я.Ф. Беляков, ков Я.Ф. БелfiledCriticalЯ.Ф. Беляков
Priority to SU138211ApriorityCriticalpatent/SU41398A1/en
Application grantedgrantedCritical
Publication of SU41398A1publicationCriticalpatent/SU41398A1/en