73288201
Dec 2, 1980
Dec 14, 1982
Industrial Plant Ventilating, Make-Up Air and Dust Control Systems Comprising One or More of the Following: Dust Filters, Diffusers, Blast Gates, Rotary Air Locks, Screw Conveyors, Conduits, Hoods, Motor Driven Fans, and Controls and Parts Therefor; Air Cleaning Systems for the Collection and Conveying of Airborne Particles Comprising One or More of the Following: Dust Filters, Centrifugal Collectors, Blast Gates, Conduits, Hoods, Motor Driven Fans, and Controls and Parts Therefor; Mechanical Roof Ventilators for Industrial Plants
Environmental Control Apparatus