Recording – communication – or information retrieval equipment – Computer – data processor equipment
patent: D195958 (1963-08-01), Spilman
patent: 4158106 (1979-06-01), Mason
patent: 4246444 (1981-01-01), Mason
Livermore Data Systems, Inc., Livermore, CA, "71 Series Data Modems" ad, 1-6-71.
Corrigan Jane E.
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