The UPU S10 standard defines a system for assigning 13-character identifiers to international postal items for the purpose of tracking and tracing them during shipping. The standard was introduced on 18 April 1996, and is currently in its 12th version.
The UPU S10 standard defines a system for assigning 13-character identifiers to international postal items for the purpose of tracking and tracing them during shipping. The standard was introduced on 18 April 1996, and is currently in its 12th version.
Source: Wikipedia "S10 (UPU standard)" · CC BY-SA 4.0
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