Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures (cooling towers E04H5/12; derricks for oil drilling E21B15/00)

Child Classifications

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• E04H 12/003
• E04H 12/02 Structures made of specified materials
• E04H 12/16 Prestressed structures
• E04H 12/18 movable or with movable sections, e.g. rotatable or telescopic
• E04H 12/20 Side-supporting means therefor, e.g. using guy ropes or struts
• E04H 12/22 Sockets or holders for poles or posts
• E04H 12/24 Cross arms
• E04H 12/26 Winding towers for mines
• E04H 12/28 Chimney stacks, e.g. free-standing, or similar ducts (chimneys as part of buildings E04F17/02)
• E04H 12/30 Water-towers
• E04H 12/32 Flagpoles
• E04H 12/34 Arrangements for erecting or lowering towers, masts, poles, chimney stacks, or the like
• E04H 2012/006