00571naa#a2200181#i#450# EN\\bibl\52941 20250118213024.6 2587-9936 20211225b2021####ek#y0engy0150####ca RUS RU Audion Competitors in the Radio Technology Market Journal article Sevastopol Federal State Educational Institution of Higher Education Sevastopol State University 2021 30 с. Journal article local . 621.37-621.39(091) RUS Pestrikov Viktor M rusjbpc.ru