Nonmetallic building materials Trademarks Filed in May 14, 1959
SHELROCK
Filed: May 14, 1959
Bricks, Blocks, and Special Shaped Molded Amorphous Silica for Refractory Uses
Owned by: DRESSER INDUSTRIES, INC.
Serial Number: 72073686
MASROCK
Filed: May 14, 1959
Bricks, Blocks and Special Shaped Molded Amorphous Silica for Refractory Uses
Owned by: DRESSER INDUSTRIES, INC.
Serial Number: 72073687
