Subclass Subgroup Patent
H02M 1/0054 12170477
  1/008 12170478
  3/1566 12170479
  3/157 12170480
  3/158 12170481
    12170482
    12170483
    12170484
  3/1582 12170485
  3/33523 12170486
  3/33584 12170487
  3/33592 12170488
  5/293 12170489
  5/4585 12170490
  7/49 12170491
  7/537 12170492
  7/5387 12170493