US PATENT SUBCLASS 122 / 220
.~.~.~.~.~ Water firebox

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

209.1  DF  SECTIONAL {9}
*  DD  .~ Horizontal sections {1}
214  DF  .~.~ Superimposed {3}
*  DD  .~.~.~ Water tube {1}
*  DD  .~.~.~.~ Internal fire tube {1}
220.~.~.~.~.~ Water firebox

DEFINITION

Classification: 122/220

(under subclass 214) Devices having water tubes provided with internal fire tubes, with a water firebox.

SEE OR SEARCH THIS CLASS, SUBCLASS:

266+, for water tube boilers having internal fire tubes.