US PATENT SUBCLASS 122 / 333
.~.~ Fluid fuel
Current as of:
June, 1999
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122 /
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LIQUID HEATERS AND VAPORIZERS
235.11
DF
WATER TUBE
{52}
332
DF
.~ Vertical {10}
333
.~.~ Fluid fuel
DEFINITION
Classification: 122/333
(under subclass 332) Devices heated by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
167, 174, 250, 283, 319, and 348, for other boilers heated by fluid fuel.