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Publication of SU178229A1publicationCriticalpatent/SU178229A1/ru
Application filed by M E Margus, Ya Sh FlejtmanfiledCriticalM E Margus
Priority to SU731877831ApriorityCriticalpatent/SU507121A1/en
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Publication of SU507121A1publicationCriticalpatent/SU507121A1/en