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