E FIXED CONSTRUCTIONS
E04 BUILDING
E04F FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
E04F15/00 Flooring
E04F15/02 Flooring or floor layers composed of a number of similar elements
E04F15/10 of other materials, e.g. fibrous or chipped materials, organic plastics, magnesite; tiles; , hardboard; , or with a top layer of other materials
E04F15/107 composed of several layers, e.g. sandwich panels