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Application filed by А. И. Яковлев и Л. С. ОкунскийfiledCriticalА. И. Яковлев и Л. С. Окунский
Priority to SU782624707ApriorityCriticalpatent/SU694561A1/ru
Application grantedgrantedCritical
Publication of SU694561A1publicationCriticalpatent/SU694561A1/ru