73376312
Jul 23, 1982
Sep 20, 1983
Non-Textile Sheets, Blocks, and Rods, All Made Wholly or Principally of Plastics and for Use in the Manufacture of Penstocks, Sluice Gates, Valves, Taps, or of Articles, Apparatus, Equipment or Installations for the Control or Treatment of Effluent, Sewage, Water, Chemicals and the Like
Rubber GoodsSluice Gates and Penstocks All Made Wholly or Principally of Plastics Material
Nonmetallic Building Materials