Direct dating codes

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Greatly simplified, the process samples living and dead trees in a given area.

The tree-ring patterns are matched, and laid down in series, building a continuous timeline of known dates.

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The interpretation of 'permanent' often depends on the context the part is used.

In the aerospace industry an aircraft part may be in service for over 30 years.

Direct part marking (DPM) is a process to permanently mark parts with product information including serial numbers, part numbers, date codes, and barcodes.

This is done to allow the tracking of parts through the full life cycle.

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