(under the class definition) Combinations of elements and devices each performing different functions for the conservation of the heat generated in the furnace, the ultimate object of which is the production of steam or the heating of water.
SEE OR SEARCH THIS CLASS, SUBCLASS:
21, for "alkali" steam generators.
448.1, 449, 450, and 452, for regulating means.
SEE OR SEARCH CLASS
60, Power Plants, generally for devices peculiar to that class.
91, Motors: Expansible Chamber Type, for plants involving the steam engine structure. 123, Internal-Combustion Engines,
2+, for combinations of internal combustion motors and other engines and steam boilers.
237, Heating Systems,
12.1, and 13 for vehicle plant and heating systems.
