12 METALLIC CONSTRUCTION MEMBERS, TELESCOPING AND PERFORATED TUBING, AND FITTINGS AND CONNECTIONS THEREFOR, ADAPTED TO SERVE AS FRAMING AND SUPPORTING MEANS FOR TEMPORARY AND PERMANENT CONSTRUCTION OF BUILDINGS AND OTHER STRUCTURES-NAMELY, CEILING, WALL AND ROOFING PANELS, RACKS, SCAFFOLDING, LADDERS, RAILS, SHELVING, BENCHES, SIGNS AND BILLBOARDS, AWNINGS, FENCES AND THE LIKE