Abstract: A multiple color multi-function light bar for a law enforcement vehicle, emergency vehicle, tow truck or the like. The light bar includes a plurality of light emitting diodes aligned in a single row. Each of the plurality of light emitting diodes are configured to emit two different colors of light through a single optical lens. Advantageously, the light bar is capable of producing a single color light pattern and a dual color light pattern based upon the particular emergency or traffic control situation encountered by an operator of the vehicle.

Abstract: For use in teaching a skill for service and repair of heating and air conditioning equipment, a teaching aid which incorporates a closed chamber, preferably insulated, which receives therein the air distribution portion of a heating and air conditioning system. The apparatus utilizes a complete miniaturized refrigerant system which has a sealed compressor unit, an evaporator, a condensor, and the appropriate lines connecting the various components. In the preferred embodiment, a removable skid mounted base supports the condensor and compressor.