DIFF Subgroup
F28F 13/185 Full Title
Arrangements for modifying heat-transfer, e.g. increasing, decreasing (F28F1/00 - F28F11/00 take precedence) > by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.