{TAIL ~ The crystal} is annealed for a period of time and at a temperature to provide substantially maximum acoustic attenuation at the operating frequency of {HEAD ~ the transducer} 
{ TAIL ~ The crystal } is annealed for a period of time and at a temperature to provide substantially maximum acoustic attenuation at the operating frequency of { HEAD ~ the transducer }
TAIL TAIL TAIL TAIL TAIL TAIL 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 HEAD