For permanent marking missing legends or other added comments to black cased
ICs.
Do they exist?, not necessarily Staedler or even white , just something
thats not dark red,green,black or blue, that stays on and contrasts with
black plastic.

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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/