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Pat. 10461557 United States, Int. Cl.22 H02J 7/00, B25F 5/00, H02J 7/02, H02M 3/04, H02M 7/04. Rechargeable tool battery, mains-operable hand-held power tool, and tool system : Appl. N 15/555882 : Filed 10.03.2016 : Pub. 29.10.2019 : / Bernd Ziegler, Holger Cecchin, Ralf Meixner ; Assignee Hilti Ag ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10461557/en?oq=US10461557.html (дата обращения: ДД.ММ.ГГГГ).