metal building materials for use in constructing transportable buildings, namely interchangeable, interconnectable, structural assemblies and components therefor, namely, truss members, truss connectors, wall panels, ceiling panels, and floor sections, including floor sections that enclose and provide flexible, reconfigurable access to HVAC ductwork and vents, electrical wiring, and data cabling

Water treatment and purification

prerecorded videotapes for classroom curricula