an insulating board having a plurality of {HEAD ~ openings} therethrough, with {TAIL ~ at least some} of the openings at positions corresponding to the IC chip contact areas 
an insulating board having a plurality of { HEAD ~ openings } therethrough , with { TAIL ~ at least some } of the openings at positions corresponding to the IC chip contact areas
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH