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This redstone tutorial shows you how to build a stylish sci-fi / laboratory / facility piston door. It relies on an ABBA switch and is a very simple straight forward build. worldfile download: http://www.mediafire.com/?8j91atix5dfilsm Music used: "The Arcade" by Machinimasound.com Licensed under Creative Commons CC-BY 3.0 Unported License | https://machinimasound.com/license