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Application filed by P. Н. Фейгин и И. Д. ЛеоненкоfiledCriticalP. Н. Фейгин и И. Д. Леоненко
Priority to SU782627443ApriorityCriticalpatent/SU688318A1/en
Application grantedgrantedCritical
Publication of SU688318A1publicationCriticalpatent/SU688318A1/en