Yesterday, we supplied a 4 layer board with L2-L4 blind vias to one of our leading customers. Their QA department called to verify whether our supplier had done those blind vias as they could not see any bumps or any marks on the layer 4 which showed them the existence of the blind vias. Our supplier sent a picture of the cross section of the portion that customer was questioning about. The cross section showed a perfect drilling and plating. Customer's QA department accepted the boards without any more questions.
We are proud of our supplier-partner for doing such a high quality work for our customers....
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