US PATENT SUBCLASS 122 / 77
.~.~.~.~ Internal water tube

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}
76  DF  .~.~.~ Drop water firebox {1}
77.~.~.~.~ Internal water tube

DEFINITION

Classification: 122/77

(under subclass 76) Devices having water tubes within some of the flues or fire tubes, which may extend into the firebox.

SEE OR SEARCH THIS CLASS, SUBCLASS:

141, and 146, for allied art.