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Application filed by Ky Otdela I Gornogo Dela So AnfiledCriticalKy Otdela I Gornogo Dela So An
Priority to SU4919337priorityCriticalpatent/RU1821621C/en
Application grantedgrantedCritical
Publication of RU1821621CpublicationCriticalpatent/RU1821621C/en