19 Non-metallic construction materials and construction parts for heat treatment chambers, namely, wood beams, construction lumber, construction materials, namely, lumber, plywood; panels for construction, namely, wall board, plaster board, particle board, board materials made of polyethelene used as a wood substitute, building stones, roof coverings, namely, shingles, tarred roofing paper, ashphalt roofing paper, slate, tiles; concrete, xyolite for use in commercial construction, asphalt, sheathing boards, tarred felt, drainage pipes, windows, glass panes, wood veneers, veneer wood for use in commercial construction; lumber, paneling for use in commercial construction; tiles for construction, parquet wood flooring, plywood, non-metal ceiling panels, brownstone gutter pipes, and wood moldings for use in construction