73233829
Oct 3, 1979
May 25, 1982
Solar Energy Transmitting Multi-Faceted and Prism Polymer Fibre Facing Panels, Sandwich Panels and Sheets Used in Collector Units
Environmental Control ApparatusSolar Energy Transmitting Multi-Faceted and Prism Polymer Fibre Facing Material in the Form of Reinforced Plastic Sheets, Blocks or Rods Used in Manufacture
Rubber GoodsSolar Energy Transmitting Multi-Faceted Prism Polymer Fibre Facing Panels, Sandwich Panels and Sheets Used in Building and Construction for Collector Units, Walls, Building Facings, Windows and Other Surfaces
Nonmetallic Building Materials