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Publication of SU397461A1publicationCriticalpatent/SU397461A1/ru
Priority claimed from SU1797726Aexternal-prioritypatent/SU397461A1/ru
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Priority to SU1797726ApriorityCriticalpatent/SU397461A1/ru
Application grantedgrantedCritical
Publication of SU397461A2publicationCriticalpatent/SU397461A2/ru