73813326
Jul 18, 1989
Apr 16, 1991
METALLIC AND NONMETALLIC ELASTOMERIC EXPANSION JOINTS REINFORCED WITH METAL AND METALLIC OR NONMETALLIC ELASTOMERIC FLEXIBLE COUPLINGS REINFORCED WITH METAL BETWEEN PARTS OF LARGE VENTILATING AND GAS CONVEYING DUCTS
Metal GoodsNONMETALLIC ELASTOMERIC EXPANSION JOINTS AND NONMETALLIC ELASTOMERIC FLEXIBLE COUPLINGS BETWEEN PARTS OF LARGE VENTILATING AND GAS CONVEYING DUCTS
Nonmetallic Building Materials