US PATENT SUBCLASS 122 / 292
.~.~.~.~.~ Firebox tube

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

235.11  DF  WATER TUBE {52}
*  DD  .~ Rearwardly declined {3}
*  DD  .~.~ Over bridge wall {1}
290  DF  .~.~.~ Front and rear header {4}
291  DF  .~.~.~.~ Horizontal-longitudinal drum {3}
292.~.~.~.~.~ Firebox tube

DEFINITION

Classification: 122/292

(under subclass 291) Devices having heating tubes extending over, through, or around the firebox, forming distinct circulation and heating conduits from the main banks of

tubes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

407, for injector type circulation means.