US PATENT SUBCLASS 137 / 297
.~.~ With heater

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

272  DF  HYDRANT TYPE {15}
294  DF  .~ With casing {3}
297.~.~ With heater

DEFINITION

Classification: 137/297

(under subclass 294) Apparatus which includes a heating means, e.g., a heat exchange device or a gas or oil burner.

SEE OR SEARCH THIS CLASS, SUBCLASS:

281, and 301+, for other means for protecting hydrants against freezing.

334+, for other apparatus of this class combined with a heating or cooling means, especially subclass 338 for hydrant and meter wells having passages for thermal circulation of air and see the search notes to subclass 334.

SEE OR SEARCH CLASS

138, Pipes and Tubular Conduits,

32+, for thawing and freeze protection of pipes and tubular conduits.