On Mon, 18 Aug 2008 10:09:58 +0100, Invisible <voi### [at] devnull> wrote:

>Even so, you can make a NAND gate out of just 2 electromechanical 
>relays.

I think that you've forgotten that electromechanical relays themselves contain
several components. The coil, the former, the armature, the contacts and don't
forget the back EMF diode.
-- 

Regards
     Stephen

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