According to the above method, the transmission surfaces of the first combination of transmission elements vibrate in a substantially same phase so that the transmission surfaces of {HEAD ~ the first combination vibrate} in {TAIL ~ an integral manner} 
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According to the above method , the transmission surfaces of the first combination of transmission elements vibrate in a substantially same phase so that the transmission surfaces of { HEAD ~ the first combination vibrate } in { TAIL ~ an integral manner }
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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL