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Application filed by М. В. Вершков, Б. М. Левин , Я. М. ФельдманfiledCriticalМ. В. Вершков, Б. М. Левин , Я. М. Фельдман
Priority to SU1473180ApriorityCriticalpatent/SU341388A1/ru
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Publication of SU341388A1publicationCriticalpatent/SU341388A1/ru