I never would have guessed you could use one of those things to engrave the inside of an object.
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Klein bottles don’t have an inside or and outside. They just have one “side”.
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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?
That’s the j-
Never mind.
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