The movement of {TAIL ~ the stem} in the axial direction is detected by a first switch means, and the rotation of the stem at the second and third positions is detected by a second switch means, whereby any one of the four display items is corrected depending upon the state of {HEAD ~ the two switch means} 
The movement of { TAIL ~ the stem } in the axial direction is detected by a first switch means , and the rotation of the stem at the second and third positions is detected by a second switch means , whereby any one of the four display items is corrected depending upon the state of { HEAD ~ the two switch means }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD