Profile: TL Engineering Co., Limited. is a space frame company available for any kind of projects required. We offer space frame, steel truss, steel structure, cladding, and coating services. Our planar truss is one where all members and nodes lie within a two-dimensional plane, while a space truss has members and nodes that extend into three dimensions. The top beams in a truss are called top chords and are typically in compression. The interior beams are called webs, and the areas inside the webs are called panels, or from graphic statics polygons.