US PATENT SUBCLASS 126 / 392
.~.~.~ Water 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}
392.~.~.~ Water tube type

DEFINITION

Classification: 126/392

(under subclass 390) Devices including a projecting tube or hollow leg containing the fluent material to be heated and completely encircled by the heating fluid.