US PATENT SUBCLASS 122 / 308
.~.~.~ Fluid fuel

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

235.11  DF  WATER TUBE {52}
305  DF  .~ Spur {8}
307  DF  .~.~ Central standpipe {3}
308.~.~.~ Fluid fuel

DEFINITION

Classification: 122/308

(under subclass 307) Devices heated by fluid fuel.

SEE OR SEARCH THIS CLASS, SUBCLASS:

245, for water tube boilers having a central stand pipe provided with coiled or looped tubes and heated by fluid fuel.

281, for water tube boilers having stand pipes provided with looped tubes.

322, for miscellaneous water tube boilers provided with stand pipes and heated by fluid fuel.