{TAIL ~ The resonator body} 1, wherein the abutting edges include {HEAD ~ undercut portions}, wherein the undercut portions of the abutting edges engage into each other so as to be locked together 
{ TAIL ~ The resonator body } 1 , wherein the abutting edges include { HEAD ~ undercut portions } , wherein the undercut portions of the abutting edges engage into each other so as to be locked together
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH 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