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