US PATENT SUBCLASS 122 / 257
.~.~.~.~ 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  .~.~ Transverse {1}
*  DD  .~.~.~ Header {1}
257.~.~.~.~ Drum


DEFINITION

Classification: 122/257

(under subclass 253) Devices in which the tubes cross each other transversely of the boiler, each tube being in communication with headers at each end, which headers are in either direct or indirect communication with a drum located above the water tubes.