(under subclass 75) Abrading machine specifically designed to
perform an abrading operation on the interior surface of a generally hollow cylindrical workpiece.
(1) Note. The workpieces of this subclass may comprise a tube, pipe, or similar structure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
381, for a work holder for supporting a hollow workpiece in an abrading machine.
SEE OR SEARCH CLASS
15, Brushing, Scrubbing, and General Cleaning,
3.5+, for cleaning of a tubular conduit. See the search note in reference to Class 451 in the subclass 3.5 definition for the line between these subclasses. 122, Liquid Heaters and Vaporizers,
395, for a sandblaster specially adapted for or combined with a boiler.
