US PATENT SUBCLASS 122 / 256
.~.~.~.~.~ Drum

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

235.11  DF  WATER TUBE {52}
253  DF  .~ Cross {3}
*  DD  .~.~ Over firebox {2}
*  DD  .~.~.~ Transverse {1}
*  DD  .~.~.~.~ Header {1}
256.~.~.~.~.~ Drum

DEFINITION

Classification: 122/256

(under subclass 253) Devices, each bank of tubes being in communication with headers at each end, which in turn are in

communication with a drum above the tubes.