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A comment on Robot cracks open safe live on Def Con's stage. Parent comment

Re:Robot cracks open safe live on Def Con's stage by Animats on Saturday July 29, 2017 @02:35AM (#14879877)
There are Sergeant and Greenleaf locks with a half-digit tolerance, so you have to get the number exactly right. They're not popular, because they're such a pain to use.
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Re:Robot cracks open safe live on Def Con's stage by blacksmythe on Saturday July 29, 2017 @12:13PM (#14881849) 

  >> half-digit tolerance
I assume you mean <0.5digit tolerance.

There is a big difference between 0.55digit tolerance (might be able to try two numbers at once with enough mechanical precision to the solver) and 0.45digit tolerance.

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