US PATENT SUBCLASS 122 / 151
.~.~.~.~ Separate

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

135.1  DF  FLUE {4}
136 R  DF  .~ Horizontal {7}
149  DF  .~.~ Return fire tube {2}
*  DD  .~.~.~ Water smoke box {1}
151.~.~.~.~ Separate

DEFINITION

Classification: 122/151

(under subclass 150) Devices having a separate compartment at the rear of the fire tubes and flues in which feed water may be heated.

SEE OR SEARCH THIS CLASS, SUBCLASS:

425, for similar structure.