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Application filed by П. Н. Дашук, Г. И. Бел Ленинградский политехнический институтfiledCriticalП. Н. Дашук
Priority to SU1844846ApriorityCriticalpatent/SU427422A2/ru
Application grantedgrantedCritical
Publication of SU427422A1publicationCriticalpatent/SU427422A1/ru
Publication of SU427422A2publicationCriticalpatent/SU427422A2/ru