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Priority claimed from SU1780589Aexternal-prioritypatent/SU438417A1/ru
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Priority to SU1780589ApriorityCriticalpatent/SU438417A1/ru
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Publication of SU438417A2publicationCriticalpatent/SU438417A2/ru
Publication of SU438417A1publicationCriticalpatent/SU438417A1/ru