75097156
May 1, 1996
May 26, 1998
concrete trench drains; concrete pipes; concrete sumps for use as collection basins for corrosive liquids and wastewater; concrete manholes for use in industries that use or store corrosive liquids comprising a pre-cast structure ready for installation and not including manhole covers; concrete structures for use with electrolyte cells; concrete equipment foundations for storing heavy equipment and electrical boxes on plant sites or in corrosive environments; concrete columns; concrete support beams and concrete corrosion resistant liners for existing structures such as trench drains, sumps, manholes or pipes, all for use in industries that use or store corrosive liquids and wastewater
Nonmetallic Building Materials