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IIRC Hero of Alexandria made a similar device 20 centuries ago: a horse statue that could had its head cut with a sword, without it falling down, with a set of gears that let the sword pass through the neck of the statue without letting the head go.

    head cut ... without letting ... go.
My mind works in mysterious ways. First thing I thought of [1].

[1] http://www.bash.org/?488793

Yes, the horse could pass a sword through its neck, and urinate after drinking. Here's a translation of his original design: https://web.archive.org/web/20120211200948/http://www.histor... and a video of its operation, on Martha Stewart of all places: http://www.youtube.com/watch?v=1gmQE2qpYB8

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