US PATENT SUBCLASS 122 / 28
.~ Water in contact

Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

*  DD  NONCOMBUSTIBLE HEATER {2}
28.~ Water in contact

DEFINITION

Classification: 122/28

(under the class definition) Boilers heated by a noncombustible hot material, either introduced into the water or having the water fed upon the hot material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

31.1, for fluid heated by injection of a hot fluid.