a first biasing means operatively connected to said spindle for biasing said measuring element in a direction for projecting from said head and thereby for biasing the outer end of said measuring element to abut against the inner wall surface of a hole in {HEAD ~ a workpiece} for measuring {TAIL ~ such hole} 
a first biasing means operatively connected to said spindle for biasing said measuring element in a direction for projecting from said head and thereby for biasing the outer end of said measuring element to abut against the inner wall surface of a hole in { HEAD ~ a workpiece } for measuring { TAIL ~ such hole }
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