DIFF Subgroup
E04H 12/08 of metal
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures > Structures made of specified materials > of metal
CPC:
Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures (cooling towers E04H5/12; derricks for oil drilling E21B15/00) > Structures made of specified materials > of metal
Of 2 combined children, 1 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
Navigate with arrow keys, Enter to open