Curtains and flexible backing tiers in the nature of non metal walls for dividing workshops and premises for industrial purposes; [ floor panels, ceiling panels, wall panels, ] separation wall panels, doors and windows with sound and heat insulating properties, not of metal; strip curtains in the nature of walls, not of metal; flexible doors, not of metal; [ non metal building panels, namely, wall, ceiling and floor panels; ] door panels, not of metal; doors, windows, [ shutters, ] partitions...