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Pat. 11252846 United States, Int. Cl.22 H05K 7/20, H02M 7/00. Ventilation device, ventilation unit, and power conversion device : Appl. N 17/040734 : Filed 24.04.2019 : Pub. 15.02.2022 : / Keisuke Inamasa ; Assignee Toshiba Mitsubishi Electric Industrial Systems Corp ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11252846/en?oq=US11252846.html (дата обращения: ДД.ММ.ГГГГ).