Subclass Subgroup Patent
F04D 29/023 09810230
  29/056 09810231
  29/086 09810232
  29/12 09810233
  29/283 09810234
  29/289 09810235
  29/382 09810236
  29/403 09810237
  29/4226 09810238
  29/4253 09810239
  29/426 09810240
  29/605 09810241