US PATENT SUBCLASS 138 / 33
.~ Electric

Current as of: June, 1999
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138 /   HD   PIPES AND TUBULAR CONDUITS

32  DF  THAWING AND FREEZE PROTECTION {3}
33.~ Electric

DEFINITION

Classification: 138/33

(under subclass 32) Devices which are in the form of an electric heater.

SEE OR SEARCH CLASS

219, Electric Heating,

535, for the electric heaters, per se, adapted for use in thawing pipes.