US PATENT SUBCLASS 122 / 236
.~ Fluid fuel

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

235.11  DF  WATER TUBE {52}
236.~ Fluid fuel

DEFINITION

Classification: 122/236

(under subclass 235) Water tube boilers heated by fluid fuel.

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23, and see the note therewith for all subclasses for boilers heated by fluid fuel.