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Application filed by В. М. Гершов , П. И. ДзюбенкоfiledCriticalВ. М. Гершов , П. И. Дзюбенко
Priority to SU1683863ApriorityCriticalpatent/SU417534A1/ru
Application grantedgrantedCritical
Publication of SU417534A1publicationCriticalpatent/SU417534A1/ru