DRILL
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Abstract
A UNITARY CUTTING DRILL DESIGNED FOR CUTTING A PLURALITY OF DIFFERENT SIZED HOLES COMPRISING A FRUSTO-CONICAL BIT HAVING ITS INCLINED SURFACE FORMED OF A SERIES OF STEPS WHICH PROGRESSIVELY INCREASE IN DIAMETER FROM THE SMALL DIAMETER END TO THE BASE THEREOF. THE INCLINED SURFACE IS RELIEVED FO MATERIAL TO FORM A CUTTING EDGE FOR EACH STEP OF THE SERIES.
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