Bell 209


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Bell 209

An AT&T standard for synchronous 9600 bps full-duplex modems using QAM modulation over four-wire leased lines or half-duplex operation over dial-up lines.
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The following list (in chronological order) gives an idea of how the design has spread over the continents: * Bell 209 HueyCobra series: first delivery in 1967; over 1400 units, including the Sea Cobra series, have been produced.