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- [1] Application No. 2020104975 (007615), IPC B23K 20/12 for RF patent for a utility model “Tool for friction stir welding”/Baraev A.V., Vaitsekhovich S.M., Dolzhanskii Yu.M. (RU)–applicant and patentee –Tekhnomash Scientific Production Association, priority of 04.02.2020 (RU)–12 p. with illustrations