US PATENT SUBCLASS 122 / 146
.~.~.~.~ Drop water firebox

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}
140.1  DF  .~.~ Internal water tube {7}
145  DF  .~.~.~ Transverse {2}
146.~.~.~.~ Drop water firebox

DEFINITION

Classification: 122/146

(under subclass 145) Devices having a drop-water-firebox.

SEE OR SEARCH THIS CLASS, SUBCLASS:

77, for analogous art.

141, for the same structure with longitudinally placed water tubes in the flue.