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This is a Harbor Freight sand/media blaster. As of Fall 2015, it's now mounted onto its own rolling bench with built-in compressor. It has been used for such purposes as removing paint and etching glass.
Current Status: Functional.
Usage: Due to noise issues, it's probably best to roll the cart out either outside (weather permitting) or at least out of the space proper. One should also not run the compressor full bore for too long. Originally, a vacuum hose attachment was being used, but actually clogs up the vacuum.
Potential upgrade: remove the lamp fixture (it gets clogged with grit and is effectively useless), and replace with a cheap battery-powered LED taplight (and consider it an expense of using it)