Scaffolding and scaffolding components of metal; modular scaffolding of metal; suspension structures of metal, namely, prefabricated steel or aluminum platforms attachable by ladders; metal lattice girders and stair towers of metal, in the nature of steel or aluminum stair towers for use with scaffolding; tower scaffolding constructions of metal, namely, prefabricated steel or aluminum scaffolding beams incorporating tubular design for use in vertical, horizontal or diagonal position in scaff...