DIFF Subgroup
F04B 39/023 Full Title
Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 > Lubrication (of machines or engines in general F01M)
Of 3 combined children, 0 exist in both systems.
3 codes are CPC-only extensions.