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Pat. 10819261 United States, Int. Cl.22 H02P 9/00, G01R 29/16, H02H 3/08, H02M 7/5387, H03K 17/082. Security improvements for electric power generator protection : Appl. N 16/732838 : Filed 02.01.2020 : Pub. 27.10.2020 : / Ritwik Chowdhury, Dale S. Finney, Normann Fischer ; Assignee Schweitzer Engineering Laboratories Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10819261/en?oq=US10819261.html (дата обращения: ДД.ММ.ГГГГ).