US PATENT SUBCLASS 122 / 252
.~.~.~ Water firebox

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

235.11  DF  WATER TUBE {52}
247  DF  .~ Coil {2}
249  DF  .~.~ Vertical {3}
252.~.~.~ Water firebox

DEFINITION

Classification: 122/252

(under subclass 249) Devices provided with a water firebox.