the filling members acting as self-supporting permanent forms (E04B5/21 takes precedence)

Floors; Floor construction with regard to insulation; Connections specially adapted therefor > Load-carrying floor structures wholly or partly cast or similarly formed > Floor structures partly formed > with stiffening ribs or other beam-like formations wholly cast between filling members > the filling members acting as self-supporting permanent forms

Floors; Floor construction with regard to insulation; Connections specially adapted therefor (elements for floors, e.g. bricks, stones, filling bodies, girders, E04C; flooring as finishing work, insulation of flooring, sectional false floors, e.g. for computers E04F15/00) > Load-carrying floor structures wholly or partly cast or similarly formed in situ (E04B5/43 - E04B5/48 take precedence; floors merely characterised by the prefabricated elements E04C) > Floor structures partly formed in situ > with stiffening ribs or other beam-like formations wholly cast between filling members > the filling members acting as self-supporting permanent forms (E04B5/21 takes precedence)