US PATENT SUBCLASS 126 / 391
.~.~.~ Fire tube type

Current as of: June, 1999
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126 /   HD   STOVES AND FURNACES

344  DF  WATER HEATERS {7}
373  DF  .~ Vessels {10}
390  DF  .~.~ Heating-surface construction and arrangement {2}
391.~.~.~ Fire tube type

DEFINITION

Classification: 126/391

(under subclass 390) Devices, including a reentrant tube or passage for the heating fluid completely encircled by the fluent contents of the vessel.

SEE OR SEARCH THIS CLASS, SUBCLASS:

389, for vent passages passing through or adjacent liquid to be heated.