After removal of the defective circuit pattern sheet 2′, the first PCB sheet {HEAD ~ 4 a} is position located by means of {TAIL ~ a position locating means} 12 
After removal of the defective circuit pattern sheet 2′ , the first PCB sheet { HEAD ~ 4 a } is position located by means of { TAIL ~ a position locating means } 12
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH