The original variant of V.21 created by AT&T
when they had a telephone system monopoly in the USA.
Last updated: 1995-02-02
Bell ♦ bell ♦ Bell 103 ♦ Bell Communications Research, Inc ♦ Bellcore
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Updated: Tue, 18 Sep 2018 07:41:57 GMT
Imperial College Department of Computing
Copyright Denis Howe 1985