This enables {HEAD ~ an engineer} to test {TAIL ~ a telephone line} by simply clipping a crocodile clip onto the test contact member and a wall member 
This enables { HEAD ~ an engineer } to test { TAIL ~ a telephone line } by simply clipping a crocodile clip onto the test contact member and a wall member
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH