{HEAD ~ The movement} of the stem in the axial direction is detected by {TAIL ~ 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 the two switch means 
is detected by
{ HEAD ~ The movement } of the stem in the axial direction is detected by { TAIL ~ 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 the two switch means
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL 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