US PATENT SUBCLASS 299 / 59
.~.~.~ Relatively driven cutters

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}
59.~.~.~ Relatively driven cutters {1}
60  DF  .~.~.~.~> Cutting area of one encircled by another

DEFINITION

Classification: 299/59

(under subclass 58) Apparatus in which the cutter means comprises two or more rotary heads which are driven so as to move relative to one another during operation.