{HEAD ~ The operation} for coupling the metallic parts only needs to nip the flanges 17 and 27 of the metallic parts 11 and 21 with {TAIL ~ the fingers} and bring the metallic parts 11 and 21 close to each other 
{ HEAD ~ The operation } for coupling the metallic parts only needs to nip the flanges 17 and 27 of the metallic parts 11 and 21 with { TAIL ~ the fingers } and bring the metallic parts 11 and 21 close to each other
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH