DIFF Subgroup
E04H 12/04 of wood
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 wood
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 wood
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
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