https://www.instructables.com/The-Unpluginator-Self-Unplugging-Useless-Box/
The Unpluginator - Self-Unplugging Useless Box : 4 Steps (with Pictures) - Instructables
The Unpluginator - Self-Unplugging Useless Box: This is an example of a Useless Machine. Its only purpose is to unplug its own power supply. It is largely 3D...
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