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Pat. 11152801 United States, Int. Cl.22 H05K 1/14, H02J 7/00, H02M 1/08, H02M 1/34, H02M 3/335, H05K 1/18. Energy level conversion circuit for portable energy storage apparatus : Appl. N 16/340322 : Filed 06.12.2018 : Pub. 19.10.2021 : / Yong Yoong Chai, Sang Deok Choi, Jungsub Choi ; Assignee Enercamp Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11152801/en?oq=US11152801.html (дата обращения: ДД.ММ.ГГГГ).