US PATENT SUBCLASS 122 / 338
.~.~.~ Annular upper drum

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}
*  DD  .~.~ Annular lower drum {4}
338.~.~.~ Annular upper drum {2}
339  DF  .~.~.~.~> Central magazine
340  DF  .~.~.~.~> Tubes over firebox

DEFINITION

Classification: 122/338

(under subclass 332) Devices, in which the water tubes communicate with the upper and the lower drums, which are of ring or equivalent form.