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Application filed by М. И. знов , Ю. П. ПотаповfiledCriticalМ. И. знов , Ю. П. Потапов
Priority to SU1800897ApriorityCriticalpatent/SU423097A1/ru
Application grantedgrantedCritical
Publication of SU423097A1publicationCriticalpatent/SU423097A1/ru