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History
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Image of a Vintage Acousticon Hearing Aid By Dictograph Products Company, Made in the US, Circa 1934.
Image of a Vintage Acousticon Hearing Aid By Dictograph Products Company, Made in the US, Circa 1934.
A bone conduction headset (GoldenDance brand)
A bone conduction headset (GoldenDance brand)
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Tuning fork by John Walker stamped with note (E) and frequency in hertz (659)
Tuning fork by John Walker stamped with note (E) and frequency in hertz (659)
Quartz crystal resonator from a modern quartz watch, formed in the shape of a tuning fork. It vibrates at 32,768 Hz, in the ultrasonic range.
Quartz crystal resonator from a modern quartz watch, formed in the shape of a tuning fork. It vibrates at 32,768 Hz, in the ultrasonic range.
A Bulova Accutron watch from the 1960s, which uses a steel tuning fork (visible in center) vibrating at 360 Hz.
A Bulova Accutron watch from the 1960s, which uses a steel tuning fork (visible in center) vibrating at 360 Hz.
1 kHz tuning fork vacuum tube oscillator used by the U.S. National Bureau of Standards (now NIST) in 1927 as a frequency standard.
1 kHz tuning fork vacuum tube oscillator used by the U.S. National Bureau of Standards (now NIST) in 1927 as a frequency standard.