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