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Application filed by Н. И. Пакулов, Е. Ф. Уль нченко , С. Е. БессоновfiledCriticalН. И. Пакулов, Е. Ф. Уль нченко , С. Е. Бессонов
Priority to SU1792154ApriorityCriticalpatent/SU430432A1/ru
Application grantedgrantedCritical
Publication of SU430432A1publicationCriticalpatent/SU430432A1/ru