One side of the runner 44 is provided with {HEAD ~ a fastening device} 5 having {TAIL ~ a protruding button} 51 
having
One side of the runner 44 is provided with { HEAD ~ a fastening device } 5 having { TAIL ~ a protruding button } 51
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH