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Pat. 11101090 United States, Int. Cl.22 G08B 21/18, H01H 47/00, H02M 3/157, G08B 25/00. Digital signal output device that outputs a digital signal in accordance with operation switch : Appl. N 16/815004 : Filed 11.03.2020 : Pub. 24.08.2021 : / Minoru Enomoto, Tetsuro Matsudaira ; Assignee Fanuc Corp ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11101090/en?oq=US11101090.html (дата обращения: ДД.ММ.ГГГГ).