(under subclass 327) Apparatus comprising a rotary type bit having a plurality of axially extending cutter elements or cutting edges which elements or edges contact the bottom of the bore and are spaced radially different distances from the longitudinal axis of rotation so that as the bit is rotated a portion of a cutter element or cutting edge engages a portion of the bore bottom not engaged by any other cutter element or cutting edge.
SEE OR SEARCH THIS CLASS, SUBCLASS:
258, for a bit having a noncutting portion forwardly of a cutting portion.
376, for a roller bit having nontracking cutting edges.
385+, for a bit including a leading portion (e.g., pilot) forming a smaller diameter initial bore.
421, for symmetrical inwardly stepped forked rotary type.
