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To create its curved surfaces, the sapphire crystal case of the Richard Mille RM056 watch was polished using an ultrasound in a pot of viscous diamond-particle filled mud.  The failure rate for such a process is high when the three parts of the case have

To create its curved surfaces, the sapphire crystal case of the Richard Mille RM056 watch was polished using an ultrasound in a pot of viscous diamond-particle filled mud. The failure rate for such a process is high when the three parts of the case have to fit to within the same one hundredth of a millimeter tolerance.

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