Structures made of specified materials

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) > Structures made of specified materials

3 direct subcodes

Child Classifications

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E04H 12/04 of wood
E04H 12/08 of metal
E04H 12/12 of concrete or other stone-like material, with or without internal or external reinforcements, e.g. with metal coverings, with permanent form elements