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It's an odd one, that... according to Ted Shutes' FB2 rewrite, the five machines puzzle isn't actually accessible anywhere in the original game, despite its presence in the editor and a guide to it appearing in the walkthrough. Possibly the author removed it, or simply forgot to tie it into any of the storylines. At any rate, if your curiosity is still fired, I think that the puzzle was reinstated in the aforementioned rewrite, as part of the Magic Valley quest. (Check under Miscellaneous files).