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Pat. 9976507 United States, Int. Cl.22 F02D 41/30, F02M 51/06, F02M 61/04, F02M 63/00, H02M 1/44, H02M 3/156, F02D 41/20, F02D 41/22, F02M 43/00, H02M 1/14. Systems for filtering a voltage signal : Appl. N 14/745408 : Filed 20.06.2015 : Pub. 22.05.2018 : / Matthew Ferguson ; Assignee General Electric Co ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9976507/en?oq=US9976507.html (дата обращения: ДД.ММ.ГГГГ).