the elements being prestressed

Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs > Structures consisting primarily of load-supporting, block-shaped or slab-shaped elements > the elements consisting of concrete, e.g. reinforced concrete, or other stone-like material > the elements being prestressed

Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs (scaffolds, shutterings E04G; structures specially adapted for buildings for special purposes, general layout of buildings, e.g. modular co-ordination, E04H) > Structures consisting primarily of load-supporting, block-shaped, or slab-shaped elements (E04B1/32 - E04B1/36 take precedence) > the elements consisting of concrete, e.g. reinforced concrete, or other stone-like material > the elements being prestressed