| http://www.w3.org/ns/prov#value | - Further, even in a case where these waveforms or other waveforms are employed, by employing the vibration waveform in which at least one of the peak and trough thereof is flat, the locus L drawn by the cutting edge takes the form such that the front end position A and the rear end position B extend in the circumferential direction of the workpiece W. This increases the portion where the front end
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