Subclass Subgroup Patent
C10B 41/00 11242488
  47/30 11242489
  53/08 11242490
C10G 31/08 11242491
  33/06 11242492
  69/14 11242493
C10J 3/42 11242494
C10L 1/02 11242495
C10M 107/36 11242496
  159/12 11242497
  169/02 11242498