US PATENT SUBCLASS 122 / 78
.~.~.~.~ Flue

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

44.1  DF  FIRE TUBE {11}
51  DF  .~ Horizontal {22}
75  DF  .~.~ Return fire tube {2}
*  DD  .~.~.~ Water firebox {1}
78.~.~.~.~ Flue

DEFINITION

Classification: 122/78

(under subclass 75) Devices having a water firebox of the large flue type.

SEE OR SEARCH THIS CLASS, SUBCLASS:

50, for similar structure in horizontal or inclined tubes.