An alternative method of line selection is illustrated in FIG 20 in which {HEAD ~ the switch panel} contains {TAIL ~ only 4 switches} 61, 63, 63, 64 and a line count display 65 
contains
An alternative method of line selection is illustrated in FIG 20 in which { HEAD ~ the switch panel } contains { TAIL ~ only 4 switches } 61 , 63 , 63 , 64 and a line count display 65
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH