I never would have guessed you could use one of those things to engrave the inside of an object.
Klein bottles don't have an inside or and outside. They just have one "side".
What's unsettling to me is, why is the only thing they could think of to engrave on it the word KLEIN in block caps? I mean, can't we get a litttttttttttle more creative here with this, since we are going to the trouble?
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