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