with the slabs, sheets or the like having grooves engaging with horizontal flanges of the supporting construction or accessory means connected thereto

Full Title

Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation (ceilings used as forms for making floors E04B5/00; coverings or linings for ceilings E04F13/00) > Connection of slabs, sheets or the like to the supporting construction > with the slabs, sheets or the like having grooves engaging with horizontal flanges of the supporting construction or accessory means connected thereto