US PATENT SUBCLASS 122 / 86
.~.~.~.~ Water firebox

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}
*  DD  .~.~ Two diameters {2}
85  DF  .~.~.~ Small diameter over firebox {1}
86.~.~.~.~ Water firebox

DEFINITION

Classification: 122/86

(under subclass 85) Devices having a water firebox.