Subclass Subgroup Patent
F03B 13/06 12392311
  13/142 12392312
  13/16 12392313
    12392314
  17/06 12392315
  17/065 12392316
F03D 1/0675 12392317
  1/0677 12392318
  1/069 12392319
  3/062 12392320
  7/0264 12392321
  7/0276 12392322
  7/042 12392323
  17/00 12392324
    12392325
  80/502 12392326
  80/709 12392327
F03G 1/029 12392328
  6/0055 12392329
  7/119 12392330