A method 1, wherein the step of obliquely cutting is performed by partially beveling said one or more corner portions of {HEAD ~ each} of {TAIL ~ said series resonators} 
of
A method 1 , wherein the step of obliquely cutting is performed by partially beveling said one or more corner portions of { HEAD ~ each } of { TAIL ~ said series resonators }
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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL