CPC Subgroup
E04H 12/34 Arrangements for erecting or lowering towers, masts, poles, chimney stacks, or the like
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) > Arrangements for erecting or lowering towers, masts, poles, chimney stacks, or the like
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