{HEAD ~ A safety device} loosely extends from {TAIL ~ the first channel} to the second channel when the first and second channel are disposed in the first operative position 
loosely extends from
{ HEAD ~ A safety device } loosely extends from { TAIL ~ the first channel } to the second channel when the first and second channel are disposed in the first operative position
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH