73196134
Dec 8, 1978
Nov 18, 1980
Ceiling Ventilating Air Distributing System Components-Namely, Air Diffusion and Pattern Control Elements, Air Chamber Structures, Volume Control Dampers and Parts Thereof; Fluorescent Lighting Fixtures with Fittings for Mounting in Suspended Ceilings and Parts Thereof
Environmental Control ApparatusSuspended Ceiling System Components-Namely, Carrier Rails, Ceiling Panels, Filler Strips, Connecting Elements and Parts Thereof
Nonmetallic Building Materials