Patents from gaming's past
See that odd diagram above? That's Nintendo's original design for the Zapper. Aside from that, you'll find other gems such as the early prototype for R.O.B., along with some other non-Nintendo patents. It's an excellent gallery of diagrams that Technologizer has put together here, so don't waste any time and dive right in. You won't be disappointed.
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[Via Joystiq]