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