DIFF Subgroup
E04H 12/2207 Full Title
Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures (cooling towers E04H5/12; derricks for oil drilling E21B15/00) > Sockets or holders for poles or posts
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.