Royal Mail 4-State

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File Format
Name Royal Mail 4-State
Ontology

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The Royal Mail 4-State (RM4SCC, or CBC for "Customer Bar Code") bar code is used in mail sorting for the United Kingdom, in its Cleanmail service. The Dutch KIX barcode is a slight variant of this format. The UK postcode and delivery unit suffix are encoded along with a check digit.

This sort of bar code system is regarded as "four-state" because there are four types of bars, classified by presence of ascenders and/or descenders. This sort of system is transcribable using DAFT notation.

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