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Date: Tue, 8 Dec 2015 23:06:37 +0100
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] gsch2pcb after refdes-renum? (If implemented
 syncronization detail)
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> > Alternative 2 refdes is used to link:
> >   1. refdes must be unique.
> 
> Many designs have multiple symbols that correspond to a single pcb
> component, so "unique refdes" will never work.
> 
> So already the refdes isn't a unique identifier for a symbol...

In such case it is a slot and the slot number could also be used?