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Application filed by В. Н. Стафеев , В. С. Белобородов, Обратный КлапанfiledCriticalВ. Н. Стафеев , В. С. Белобородов
Priority to SU1748486ApriorityCriticalpatent/SU421842A1/ru
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Publication of SU421842A1publicationCriticalpatent/SU421842A1/ru