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Touch Tone Dialing

The surprising history of touch tone dialing in the US. From the podcast, "Twenty Thousand Hertz."
Found by Don MacKinnonDon MacKinnon
From the podcast Twenty Thousand Hertz
Found by Don MacKinnonDon MacKinnon
From the podcast Twenty Thousand Hertz
2 MINSPlayer button

    Surprising Histories
    12 clips 31 MINS
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