US PATENT SUBCLASS 29 / 81.02
.~ For hollow workpiece

Current as of: June, 1999
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29 /   HD   METAL WORKING

81.01  DF  SCALE REMOVER OR PREVENTOR {9}
81.02.~ For hollow workpiece {1}
81.021  DF  .~.~> Interior surface

DEFINITION

Classification: 29/81.02

For hollow workpiece:

(under subclass 81.01) Process or apparatus for removing scale from the surfaces of a tubular or open cylindrical article.

SEE OR SEARCH CLASS

15, Brushing, Scrubbing, and General Cleaning,

88, for a machine having a cleaning instrument of the brush or broom type especially adapted for cleaning wire, rods, or tubes.