US PATENT SUBCLASS 299 / 60
.~.~.~.~ Cutting area of one encircled by another

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

DEFINITION

Classification: 299/60

(under subclass 59) Apparatus in which the cutter teeth on one of the rotary heads form a path of rotation which falls

entirely within a circle described by the path of rotation of the cutter teeth on another rotary head.