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Pat. 11081872 United States, Int. Cl.22 H02M 3/00, G08B 17/06, G08B 25/04, H02H 1/00, H02H 3/04, H02H 3/16. Method for localising an earth fault of a fire protection system : Appl. N 16/607676 : Filed 19.04.2018 : Pub. 03.08.2021 : / Detlef Mandelkau ; Assignee Minimax Gmbh and Co Kg ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11081872/en?oq=US11081872.html (дата обращения: ДД.ММ.ГГГГ).