Subclass Subgroup Patent
C25B 9/23 12168831
  9/65 12168832
  11/075 12168828
  15/02 12168829
  15/085 12168830
C25C 1/22 12168833
C25D 1/04 12168834
  3/60 12168837
  5/611 12168838
  11/08 12168835
  13/02 12168836