US PATENT SUBCLASS 122 / 27
.~ Surface

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

*  DD  NONCOMBUSTIBLE HEATER {2}
27.~ Surface

DEFINITION

Classification: 122/27

(under the class definition) Boilers heated by a noncombustible hot material, such as slag, bars, or pigs of iron, or brick that does not come into contact with the liquid to be heated.