This would be incredibly useful on various planetary surfaces, were there is an abundance of minerals to use as feedstocks for such a device.

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January 21, 2013: The End of an ERROR.

"Only a virtuous people are capable of freedom. As nations become more corrupt and vicious, they have more need of masters."
"When the people find that they can vote themselves money, that will herald the end of the republic."
"The Constitution only gives people the right to pursue happiness. You have to catch it yourself."
---Benjamin Franklin