US PATENT SUBCLASS 122 / 289
.~.~.~ Updraft

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

235.11  DF  WATER TUBE {52}
*  DD  .~ Over firebox {2}
*  DD  .~.~ Water grate {1}
289.~.~.~ Updraft

DEFINITION

Classification: 122/289

(under subclass 235) Water tube boilers having water tubes over the firebox and with an updraft water grate.