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