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Pat. 10833615 United States, Int. Cl.22 H02P 7/29, F04D 25/08, H02M 3/155, H02P 1/18, H02P 7/282. Methods for controlling a voltage present at an electric fan : Appl. N 16/195060 : Filed 19.11.2018 : Pub. 10.11.2020 : / Dirk Hertz, Florian Ringer, Marco Schonenberg ; Assignee Siemens Ag ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10833615/en?oq=US10833615.html (дата обращения: ДД.ММ.ГГГГ).