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BS ISO/IEC 4873:1991
Information technology. ISO 8-bit code for information interchange. Structure and rules for implementation (British Standard)
Specifies an 8-bit code which is derived from, and compatible with, the 7-bit coded character set specified in ISO/IEC 646. The normative Annex A gives restrictions applicable to the C0 and C1 sets.
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British Standards Institution [bsi]