19 Building materials (not of metal); pipes (not of metal) for building purposes; transportable buildings (not of metal); scaffolding of any type, not of metal, particularly construction and other work scaffolds, safety scaffolds; support scaffolding, not of metal, such as erecting scaffolding, falsework and soffit scaffolding, ice-free scaffolds, mobile scaffolds, tower scaffolding, work platforms and maintenance platforms, grandstands, podiums; parts of scaffolding, each not of metal as far as included in this class, in particular vertical frames, corner frames, entrance frames, diagonals, rail braces, front railing frames, railing frames, platforms, railing posts; bracket post, protective roof brackets, not of metal, retainers, not of metal, for scaffold platforms, protective side gratings, not of metal, spare parts, not of metal, for frameworks; lattice girders, not of metal; intermediate rungs, not of metal; height-adjustable bases, not of metal, for scaffold frameworks and scaffolding; railings, not of metal; banisters, roofs and roof constructions (not of metal), dismountable halls and buildings (not of metal); formwork and material chutes, not of metal, for building purposes; transportable lightweight halls and roofings (each not of metal); tunnel profile adapters, deck protection, lattice girder connectors, scaffolding couplers and ladder couplers, gravity pins, tie bars (each not of metal); prefabricated parts (not of metal) for erecting the aforesaid goods as far as included in this class; stairs not of metal; safety fences and protective grids (not of metal) in the field of scaffolding, platforms and ladders; crossings of plastic; safety fences, grids, protective grids, machine protection grids, robot protection grids, fences, safety fences, safety guards, all of the aforesaid goods not of metal