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Application filed by Ю. П. Колпаков , И. Бел хннfiledCriticalЮ. П. Колпаков , И. Бел хнн
Priority to SU1762859ApriorityCriticalpatent/SU424245A1/ru
Application grantedgrantedCritical
Publication of SU424245A1publicationCriticalpatent/SU424245A1/ru