US PATENT SUBCLASS 122 / 97
.~.~.~.~ Downdraft

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

44.1  DF  FIRE TUBE {11}
51  DF  .~ Horizontal {22}
90  DF  .~.~ Water firebox {8}
*  DD  .~.~.~ Water grate {2}
97.~.~.~.~ Downdraft

DEFINITION

Classification: 122/97

(under subclass 90) Devices having a downdraft water grate.