Method of making through hole with laser, copper clad laminate suitable for making hole, and {HEAD ~ auxiliary material} for making {TAIL ~ hole} 
for making
Method of making through hole with laser , copper clad laminate suitable for making hole , and { HEAD ~ auxiliary material } for making { TAIL ~ hole }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL