DIFF Subgroup
B27K 3/46 Coal tar
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Impregnating wood, e.g. for protection > Organic impregnating agents > Tar; Mineral oil > Coal tar
CPC:
Impregnating wood, (dyeing, staining B27K5/00) > Organic impregnating agents > Tar; Mineral oil > Coal tar
No child classifications to compare. This is a leaf node in both IPC and CPC.