1931: Digital Readout? Well, It's a Start!
Vintage radio ads have always fascinated me. This "Fada" ad touts the new "Automatic Flashograph" which assisted the owner to zero in on the exact frequency, guided by a neon light indicator. My family had a radio with a round green indicator with a black "pupil" in the center. As you moved away frotuned it to the desired frequency, two vertical lines converged.
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