US PATENT SUBCLASS 122 / 139
.~.~ 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}
139.~.~ Drop water firebox

DEFINITION

Classification: 122/139

(under subclass 136) Devices with a drop water firebox at one end of the boiler.

SEE OR SEARCH THIS CLASS, SUBCLASS:

58+, for horizontal fire tube boilers with drop water firebox

of analogous structure.

141, 146 and 148, for other types of horizontal flue boilers with drop water fireboxes.