(under subclass 29) Apparatus in which the power operated means causes the cutter to cyclically longitudinally impact upon or against the hard material.
(1) Note. For the definition of cutter see this class, subclass 79.
SEE OR SEARCH THIS CLASS, SUBCLASS:
62, for a rotary cutter head with advance direction coincident to rotary axis in which the drive follows the cutter into an opening formed thereby, and in which the rotary head carries an impact type cutter.
SEE OR SEARCH CLASS
173, Tool Driving or Impacting,
90+, and see the search there noted for a tool impacting device.
