US PATENT SUBCLASS 299 / 62
.~.~.~ With percussive-type cutter

Current as of: June, 1999
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299 /   HD   MINING OR IN SITU DISINTEGRATION OF HARD MATERIAL

29  DF  HARD MATERIAL DISINTEGRATING MACHINES {17}
55  DF  .~ Rotary cutter head with advance direction coincident to rotary axis {2}
58  DF  .~.~ Machine follows cutter into opening formed thereby {3}
62.~.~.~ With percussive-type cutter

DEFINITION

Classification: 299/62

(under subclass 58) Apparatus including cutter teeth which cyclically impact upon or against the hard material.