US PATENT SUBCLASS 122 / 341
.~.~.~ Fire tube 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}
341.~.~.~ Fire tube upper drum

DEFINITION

Classification: 122/341

(under subclass 332) Devices in which the water tubes communicate with an annular lower drum and with an upper drum provided with fire tubes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

342, and 343, for boilers of similar structure, but whose upper drum is not provided with fire tubes.