US PATENT SUBCLASS 122 / 33
.~.~.~ Furnace

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

*  DD  INDIRECTLY HEATED {1}
*  DD  .~ Separate fluid {1}
32  DF  .~.~ Surface {2}
33.~.~.~ Furnace

DEFINITION

Classification: 122/33

(under subclass 32) Devices, provided with a furnace forming a part of the unitary structure.