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Pat. 10797472 United States, Int. Cl.22 C02F 1/00, C02F 1/46, H01T 19/04, H02M 3/335, H02M 7/06. Electron generation apparatus capable of multi-stage boosting for variable capacity : Appl. N 16/722106 : Filed 20.12.2019 : Pub. 06.10.2020 : / In Ho Lee, Young Pyo Hong, Ji Young Park, Mun Gu Lee, Tae Hun Lee, Chan Young Park, Gyeong Han Son ; Assignee Groon Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10797472/en?oq=US10797472.html (дата обращения: ДД.ММ.ГГГГ).
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