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Pat. 10193489 United States, Int. Cl.22 H02P 27/08, G10K 9/12, H02M 1/08, H02M 7/5395. Method and apparatus for acoustic signal generation : Appl. N 15/618573 : Filed 09.06.2017 : Pub. 29.01.2019 : / Yo Chan Son, Si-Hyung Lee, Aayush Gupta ; Assignee GM Global Technology Operations LLC ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10193489/en?oq=US10193489.html (дата обращения: ДД.ММ.ГГГГ).