(under subclass 115) Abrading machine by which a plug cock and its seat are abraded to fit by mutual moving contact, with or without an abrasive supply.
SEE OR SEARCH CLASS
408, Cutting by Use of Rotating Axially Moving Tool,
83.5, for a portable valve refitting device involving the use of a cutting tool that turns about an axis and moves along that axis with respect to a workpiece.
409, Gear Cutting, Milling, or Planing,
175+, for a portable valve refitting device involving the use of a milling cutter.
