A scratch is made at least at {HEAD ~ one corner portion} of {TAIL ~ the cathode ray tube} and heat is applied so as to flank the scratch from the two sides 
of
A scratch is made at least at { HEAD ~ one corner portion } of { TAIL ~ the cathode ray tube } and heat is applied so as to flank the scratch from the two sides
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH