|6171173||Toy refrigerator having an activity surface|
The present invention teaches a toy refrigerator with a body and a door that has an activity surface, which is either a metallic surface or a writing surface, such as a whiteboard. The body and the door is made either from plastic material or from wood. T...
|4068391||Refrigeration system demonstration device|
A demonstration device for simulating the operation of a heat pump system comprising a schematic representation of a heat pump system, a plurality of lamps and associated electrical circuitry adapted to illuminate portions of the schematic representation ...
|3934356||Teaching aid for air conditioning apparatus|
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 s...