It should be noted that the embodiments are applicable to {HEAD ~ a piezoelectric resonator element} having {TAIL ~ one resonating arm} or a piezoelectric resonator element having two or more of resonating arms 
having
It should be noted that the embodiments are applicable to { HEAD ~ a piezoelectric resonator element } having { TAIL ~ one resonating arm } or a piezoelectric resonator element having two or more of resonating arms
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH