6 metal mobile and stationary loading and access equipment, namely, barriers, catwalk systems, comprised of various metal shapes and components, namely, gratings, rails, ladders, staircases and other components sold as a unit; expansion towers, gangways, marine gangways, loading arms, loading racks, stairs, stair towers and handrail systems comprised of various metal shapes and components, namely, gratings, rails, ladders, staircases and other components sold as a unit, all made of aluminum or steel; and platforms made of aluminum or steel; and Metal stairs and manually moveable metal platforms for use in accessing rail cars, trucks, and other transport vehicles, and ground support equipment, namely, fall protection enclosures and fall prevention enclosures for rolling stock made of metal, aircraft maintenance ladders, B-1 stands, and mobile work platforms for aviation; and elevating work platforms made of aluminum or steel