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