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Application filed by Ю. М. Щелчков, Г. С. Иванов и Л. А, ПюрбеевfiledCriticalЮ. М. Щелчков, Г. С. Иванов и Л. А, Пюрбеев
Priority to SU772481305ApriorityCriticalpatent/SU665132A1/ru
Application grantedgrantedCritical
Publication of SU665132A1publicationCriticalpatent/SU665132A1/ru