US PATENT SUBCLASS 237 / 19
COMBINED WITH WATER HEATER
Current as of:
June, 1999
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237 /
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HEATING SYSTEMS
19
COMBINED WITH WATER HEATER
DEFINITION
Classification: 237/19
(under the class definition) Heating systems having means for heating the fluid used in the system and also for additional volume of water.
SEE OR SEARCH CLASS
122, Liquid Heaters and Vaporizers,
20, for subsidiary boilers.
126, Stoves and Furnaces,
5, for combined cooking and heating stoves; 513+ for
fireplaces having water backs and 366, for submerged water heater systems.
