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Pat. 11165257 United States, Int. Cl.22 H02J 3/46, G05B 17/02, H02M 7/493. System and method for frequency adjustment of parallel inverters coupled to a grid power source : Appl. N 16/271775 : Filed 08.02.2019 : Pub. 02.11.2021 : / Jacob R. Decock, Robert B. Shaw, Tianjun Fu, Long Wu ; Assignee Deere and Co ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11165257/en?oq=US11165257.html (дата обращения: ДД.ММ.ГГГГ).