mismatched serial numbers

Started by Mister T, August 03, 2023, 07:09:56 PM

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Mister T

August 03, 2023, 07:09:56 PM
Does anyone know when the possibility of mismatched serial numbers ended? I'm guessing at some point in the polymer series that numbering began being done by computers rather than mechanically but I'm not sure when.
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