BarCode Postal Technology BPO four state code

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BPO four state code: the British Post Office postal code barcode for mail. Only characters A to Z and 0 to 9 can be encoded; spaces are ignored. Each character consists of four bars. There are four types of bar, i.e. it is a '4-state' code.

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Variant 1
Standard 5mm high barcode for UK post codes