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The remote possibilities here are staggering. If we could send beeps in the human vocal range over phone lines to control things, it could revolutionize telephony!

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Just be sure that cereal box giveaways don't whistle at the same frequencies (aren't tuned to concert pitch?)

Ha! In case you're one of today's lucky 10,000 https://en.m.wikipedia.org/wiki/John_Draper

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