Zipper trucks, AKA "barrier transfer machines", in action.
New plans added on 11/20: Click here for 2,589 plans for homemade tools.
PJs (Nov 10, 2016)
That looks familiar! Quite the machine but it weird's you out visually when you go to pass it.
‘‘Always do right. This will gratify some people and astonish the rest.’’ Mark Twain ~PJ
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