75479386
May 4, 1998
NON-METALLIC BUILDING MATERIALS, NAMELY, CONCRETE, GYPSUM, ASPHALT, PITCH, ASPHALT BITUMEN, AND ARTIFICIAL STONE TO WHICH MICRON-SIZED PARTICLES OF VARIOUS MATERIALS HAVE BEEN APPLIED TO THE SURFACE THEREOF OR INTEGRATED INTO THE BULK THEREOF
Nonmetallic Building Materials