US PATENT SUBCLASS 122 / 141
.~.~.~.~ 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}
*  DD  .~.~.~ Longitudinal {1}
141.~.~.~.~ Drop water firebox

DEFINITION

Classification: 122/141

(under subclass 140) Devices having a drop water firebox with longitudinal water tubes in the flues.

SEE OR SEARCH THIS CLASS, SUBCLASS:

77, and 146, for allied art.