US PATENT SUBCLASS 175 / 377
.~.~ Spiral rib or tooth row

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

327  DF  BIT OR BIT ELEMENT {21}
331  DF  .~ Rolling cutter bit or rolling cutter bit element {26}
377.~.~ Spiral rib or tooth row

DEFINITION

Classification: 175/377

(under subclass 331) Apparatus in which the rolling cutter element is provided with a portion which has a cutting edge or edges arranged along a line or series of lines extending around the circumference of the element and simultaneously extending in a direction along the axis of the cutter element (e.g., helical).