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Pat. 10573471 United States, Int. Cl.22 H01H 9/54, G06F 1/30, H01H 89/00, H02M 7/06, H01H 50/54, H02J 3/00. System for electric load controlling using smart three-way switches : Appl. N 15/689812 : Filed 29.08.2017 : Pub. 25.02.2020 : / David Haidong Fu, Yajun Zhang ; Assignee Tp-Link Research America Corp ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10573471/en?oq=US10573471.html (дата обращения: ДД.ММ.ГГГГ).