60 Hz: Binaural Beats (Gamma Waves) - song and lyrics by Miracle Healing Tones TP, Solfeggio Frequencies TP | Spotify
A 6000 Hz tone must have what sound level to seem as loud as a 100 Hz tone that has a 50 dB sound level? - Quora
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Fluke Networks PRO3000F60-KIT Includes Tone Generator & Probe with 60Hz Filter and SmartTone Technology, 4962074: Amazon.com: Industrial & Scientific
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
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