US PATENT SUBCLASS 122 / 335
.~.~ Annular firebox

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

235.11  DF  WATER TUBE {52}
332  DF  .~ Vertical {10}
335.~.~ Annular firebox

DEFINITION

Classification: 122/335

(under subclass 332) Devices having an annular or surrounding firebox.

SEE OR SEARCH THIS CLASS, SUBCLASS:

246, for coiled or looped water tubes around a stand pipe having an annular firebox.

309, for water tube boilers having a central stand pipe provided with spur tubes and extending below the fire grate to form an annular firebox.