Subclass Subgroup Patent
B63B 1/14 09809279
  21/20 09809280
  22/22 09809281
  25/16 09809282
  35/44 09809283
  35/7906 09809284
  35/7926 09809285
  35/793 09809286
B63C 11/22 09809287
B63H 16/04 09809288
  20/10 09809289
    09809290
  23/32 09809291
  25/02 09809292