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Ultrasound machines have been around for approximately 50 years, and are used in conjunction with many conditions, including pregnancy and tumors in the body. The average low-limit frequency of an ultrasound machine is 20 kilohertz. Upper frequency limits, however, will vary from person to person.
Source:
Ultrasound Machine Guru: What You Don't Know About Ultrasound Machines
Portable Ultrasound Machines: Ultrasound Machines and their Medical Applications
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