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V21

V21 or V.21 may refer to. [1]

2 relations: Fokker D.VII, List of ITU-T V-series recommendations.

Fokker D.VII

The Fokker D.VII was a German World War I fighter aircraft designed by Reinhold Platz of the Fokker-Flugzeugwerke.

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List of ITU-T V-series recommendations

The ITU-T V-Series Recommendations on Data communication over the telephone network specify the protocols that govern approved modem communication standards and interfaces.

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References

[1] https://en.wikipedia.org/wiki/V21

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