The covering is stored on a reel, and pulled off from the reel as it is replaced, and {HEAD ~ the used covering} is taken up on {TAIL ~ a second reel} 
is taken up on
The covering is stored on a reel , and pulled off from the reel as it is replaced , and { HEAD ~ the used covering } is taken up on { TAIL ~ a second reel }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL