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These people are fools not to have a stock of some of these objects manufactured, and quick buy links next to everything.

Some people looking at this cruft may want it.

The Klein bottle guy sells, right?

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Assuming an architect doesn't have the right kind of workshop needed to make them herself, the capital outlay to tool up any of those objects except the broom and the fork (for which you'd take existing products and modify) would be pretty enormous. The ruler probably would be the easiest - a company that already makes steel rulers could likely make it for a relatively modest set-up cost.

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