(under subclass 32) Open pans provided with a liquid receptacle between them and a source of heat. The liquid receptacle contains a liquid other than that undergoing concentration.
SEE OR SEARCH THIS CLASS, SUBCLASS:
21, for combined open and closed pans.
SEE OR SEARCH CLASS
126, Stoves and Furnaces,
347, for kettle furnaces with a horizontal extension of the combustion chamber, and subclass 377 for water heating vessels heated by steam or water.
