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When was beeping invented, in a user interface sense?

Tones as means of user interface were invented in 1908: Invented by engineer August Kruckow, the dial tone was first used in 1908 in Hildesheim, Germany Note that in Europe, call progress tones are ...
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4 votes

When was beeping invented, in a user interface sense?

A beep is a fixed frequency signal generated by one of the most simple electronics possible. It predates for sure any more complex electronic sound. So the answer may be: It was used as soon as ...
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