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What was the frequency of the early dial tone in America? Give the answer in Hz, but you do not need to explicitly write Hz or Hertz. - Quora
frequency - Why does 60 Hz mean 60 refreshes and not 120? - Electrical Engineering Stack Exchange
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Understanding the Different Frequency Ranges – Mastering The Mix
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A simple 60 Hz sine wave is shown with the amplitude, peak-to-peak,... | Download Scientific Diagram
Color online) Mean FFR spectra obtained for 8-and 87-Hz tones (N ¼ 9)... | Download Scientific Diagram
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Description • By selectively filtering out 60Hz (or 50Hz) and its harmonics, the 200FP can be used with any tone generator for
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