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From: "Smilie (smilie AT posteo DOT de) [via geda-help AT delorie DOT com]" <geda-help AT delorie DOT com>
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Subject: Re: [geda-help] pcb: blind/buried VIA in Gerber-Files
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But i read also the following:

File format Gerber is maintained by Ucamco / Former Barco ETS.

Google: Ucamco + Gerber 
delivers: The Gerber File Format Specification . pdf


Page 145 have some Info about the Option (PTH|Blind|Buried)for
Drill,Route or Mixed for Plated or NonPlated.


I have not understand complete.