{HEAD ~ An improved duress feature} preferably uses a modified tumbler wheel assembly and {TAIL ~ a duress switch} to trigger the alarm 
{ HEAD ~ An improved duress feature } preferably uses a modified tumbler wheel assembly and { TAIL ~ a duress switch } to trigger the alarm
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH