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Application filed by Е. В. Курков, А. Ф. Белов , М. Н. Ситников, Электронные ЧасыfiledCriticalЕ. В. Курков, А. Ф. Белов , М. Н. Ситников
Priority to SU1816676ApriorityCriticalpatent/SU453662A1/ru
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Publication of SU453662A1publicationCriticalpatent/SU453662A1/ru