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