{HEAD ~ This readhead asymmetry} is determined by the method of {TAIL ~ this invention}, which is accomplished by measuring the output voltage pulses of the readhead when it is excited by magnetic pulses both forward and rear of its read gap 
{ HEAD ~ This readhead asymmetry } is determined by the method of { TAIL ~ this invention } , which is accomplished by measuring the output voltage pulses of the readhead when it is excited by magnetic pulses both forward and rear of its read gap
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