73217892
May 31, 1979
May 5, 1981
Electrostatic Air Filters; Electrical, Mechanical, and Pneumatic Controls for Heating and Air Conditioning Equipment; Electrical Controls for Controlling the Charge in Refrigeration Systems; and Parts Therefor
Electrical and Scientific ApparatusRefrigeration Units; Fluid, Air, and Water Heaters and Coolers for Domestic, Commercial, and Industrial Uses; Air Delivery and Handling Units for Cooling; Heating, and Ventilating Domestic, Commercial, and Industrial Buildings, and for Use in Commercial Process Applications; Air Induction Units; Air Filters, Humidifiers, Ventilators, Diffusers, Blenders, and Convectors; Refrigerant Condensers, Evaporators, and Absorbers; Fans and Blowers; (( Boilers; )) Electric, Gas, and Oil furnaces; Heat Pumps; Hydrocarbon Fuel burners, Incinerators; Heat Exchangers for use in Heat Transfer for Industrial and commercial Uses; Shell and Tube, Fin and tube, and Plate and Fin Heat Exchangers; and Parts Therefor
Environmental Control ApparatusRental of Tools for the Repair of Heating and Air Conditioning Equipment; Chemical and Metallurgical Analysis of Heating and Air Conditioning Equipment; Analyzing the Heating and Air Conditioning Requirements of Others by Means of a Computer; and Consulting Services in the Field of Heating and Air Conditioning Requirements
Computer and Scientific