(under subclass 228) Subject matter including apparatus to affect the temperature of the water contained in the fish enclosure by heat transfer means.
SEE OR SEARCH THIS CLASS, SUBCLASS:
262, for an aquarium with a heat exchanger.
SEE OR SEARCH CLASS
392, Electric Resistance Heating Devices,
441, for a tank-type liquid heater, and subclass 458 for a heating device located outside the tank and in heat exchange relation to the liquid to be heated.
