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