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