In order to remove {HEAD ~ hollow closed end needle} 10 force is applied to remove stopper 26 with {TAIL ~ its teeth} 27 and 28 from surface 31 
In order to remove { HEAD ~ hollow closed end needle } 10 force is applied to remove stopper 26 with { TAIL ~ its teeth } 27 and 28 from surface 31
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH