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Application filed by И.М. Лапшин, Н.Л. МасленниковаfiledCriticalИ.М. Лапшин
Priority to SU380656ApriorityCriticalpatent/SU76291A1/en
Application grantedgrantedCritical
Publication of SU76291A1publicationCriticalpatent/SU76291A1/en