US PATENT SUBCLASS 175 / 15
.~ Rotating the heating tool

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

11  DF  BORING BY DIRECTLY APPLYING HEAT TO FLUIDIZE OR COMMINUTE {5}
15.~ Rotating the heating tool

DEFINITION

Classification: 175/15

(under subclass 11) Subject matter in which the heat applying or directing device is continuously rotated about an axis.