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<3 PS1. In Ollie's seminal "Impressioning" he also used SEM to look at keys as they were impressioning locks.

oohh i'm going to have to dig to find the one on impressioning

I'm not sure if this is what he was talking about, but it seems like this is related:

Definitely related, and datagram & I covered the basics the year prior as well: http://www.youtube.com/watch?v=_-PqzkoQQ7s