19 Wall cover parts (not of metal) in sandwich construction with non-metallic inserts; wall shells (not of metal) in sandwich construction with non-metallic inserts, in particular an acoustic fleece; partitions, not of metal; building materials [non-metallic]; perforated panels, not of metal, transportable buildings, not of metal; panels for wall and ceiling coverings, not of metal; wall and ceiling panels (not of metal) of sandwich construction with a perforated outer surface or of honeycomb construction; perforated panels [not of metal]; non-metallic lining parts for building