73192194
Nov 6, 1978
Dec 30, 1980
Construction and Building Elements-Namely, Utility Vaults and Boxes, Highway Median Barriers, Sound Walls Including Equipment Screening Panels, Manholes, Junction Boxes and Pull Boxes, Equipment Mounting Pads and Pedestals, Pole Guards, Cable Troughs, Terminator Blocks, Planter Boxes, Steps, Balconies and Security Storage Buildings, All Made of Preformed Concrete
Nonmetallic Building Materials