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Blue Box

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Shhh... actually not really, I don't plan on actually using one, but I'd like to build one, if anyone can hook me up with a schematic for a working blue box, I'd greatly appreciated, I mean I know if I took the time, I could find one, but I gotta leave for work in like 10 minutes, and I have a bad memory, so I might as well ask before I forget to look.

Also correct me if I'm wrong, but is it illegal to own one even if it's only for display (mounted in a case) ?
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