beams made of wood; beams, not of metal; non-metallic nail plates in the nature of reinforcing materials for the assembly of roof trusses; non-metal hips for roofing; non-metallic composite materials for use in roofing, namely, timber or lumber chords, wooden blocks and adhesives; non-metallic building materials for roofs, namely, timber trusses, space frames, structural beams, non-metal metallic composite timber structural beams; non-metallic ready mountable parts for roof constructions, nam...