73315190
Jun 17, 1981
May 17, 1983
Active Trademark
Ventilating Outlets and Grills for the Exhaust and Intake of Air; Heat Exchangers for Transferring Heat from Relatively Hot Air to Relatively Cold Air; Louvers and Ventilating Registers; Air Flow Dampers; Fire Dampers for Ventilating Conduits; Ventilating Conduits; Power-Driven Air Fans; and Combinations Thereof
Environmental Control Apparatus