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