Then {TAIL ~ the space} which is formed by removing the defective circuit pattern sheet 2′ is filled with a second PCB sheet 4 b on which a good quality circuit pattern {HEAD ~ 2 b} is printed 
Then { TAIL ~ the space } which is formed by removing the defective circuit pattern sheet 2′ is filled with a second PCB sheet 4 b on which a good quality circuit pattern { HEAD ~ 2 b } is printed
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH