When this ad was written, sci-fi movies and shows would usually have an oscilloscope (a rather new invention at the time) or two in the background displaying a sine wave (almost always showing the graphical representation of the most commonly available signal around, the voltage from the power outlet it is plugged into). I guess it became the de facto futuristic signal. :)
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timeasmymeasure
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Date: 2015-07-25 05:13 pm (UTC)