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