(under the class definition) Steam generators or water heaters located either in the firebox, combustion chamber, or offtake flue of a furnace whose main purpose is not for the generation of steam or the heating of water in such boiler. These boilers may be of any form consisting of mere pipes or coils, hollow plates, or cylinders with or without fire flues or tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
6+, 10, 37, 38, 439, and 498, for analogous structure.
SEE OR SEARCH CLASS
126, Stoves and Furnaces,
5, 31, 34, 101, 513+, 364, and 365, for analogous art not of general application.