Apparatus 7, in which {TAIL ~ each tube} is extruded to form separate integral ducts {HEAD ~ each} adapted to house a strand 
Apparatus 7 , in which { TAIL ~ each tube } is extruded to form separate integral ducts { HEAD ~ each } adapted to house a strand
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH