US PATENT SUBCLASS 122 / 325
.~.~.~ Plural lower drum

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

235.11  DF  WATER TUBE {52}
324  DF  .~ Straddle {2}
*  DD  .~.~ Plural upper drum {1}
325.~.~.~ Plural lower drum {1}
326  DF  .~.~.~.~> Cross

DEFINITION

Classification: 122/325

(under subclass 324) Devices in which the tubes are either in communication with headers at top and bottom, which are in turn in communication with separate upper and lower drums, or in communication directly with separate upper and lower drums.

SEE OR SEARCH THIS CLASS, SUBCLASS:

240, for miscellaneous fire tube boilers having a plurality of fireboxes.

351, for vertical water tube boilers having a plurality of upper and lower drums.