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Pat. 11190117 United States, Int. Cl.22 H02P 6/14, H02J 7/34, H02M 1/32, H02M 3/157, H02M 5/458, H02P 27/06. Apparatus and method for storing energy : Appl. N 15/479933 : Filed 05.04.2017 : Pub. 30.11.2021 : / Jens Onno Krah ; Assignee Beckhoff Automation Gmbh and Co Kg ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11190117/en?oq=US11190117.html (дата обращения: ДД.ММ.ГГГГ).