Example: air traffic controller
commodity codes
031-26 Control Systems: Complete (for Automatic Temperature Control) 031-27 Cooling Tower Water Treatment: Non-chemical Ozone, Centrifugal Separators, Magnetic Descaling Equip. (see Class 885 for Chemical Types) 031-28 Cooling Towers: Forced Air, Gravity, etc. 031-29 Dampers, Motorized 031-30 Dehumidifiers and Humidifiers Page 8 of 344
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