The article 1 is produced by means of a mould 10 whose moulding surface 11 has {HEAD ~ a shape} matching {TAIL ~ the shape} of the convex surface 4 of the required article 1 
matching
The article 1 is produced by means of a mould 10 whose moulding surface 11 has { HEAD ~ a shape } matching { TAIL ~ the shape } of the convex surface 4 of the required article 1
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH