In order to prevent the adhesive from curing prematurely and inadvertently, {HEAD ~ at least the plug in assembly} is surrounded by {TAIL ~ an opaque package} 60 until the time when it is fitted 
is surrounded by
In order to prevent the adhesive from curing prematurely and inadvertently , { HEAD ~ at least the plug in assembly } is surrounded by { TAIL ~ an opaque package } 60 until the time when it is fitted
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH