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PCE
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CPC Subgroup
E04H 12/28

Chimney stacks, e.g. free-standing, or similar ducts (chimneys as part of buildings E04F17/02)

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) > Chimney stacks, e.g. free-standing, or similar ducts (chimneys as part of buildings E04F17/02)