Chapter 1 History and Development of Mechanical Vibration Therapy
A hollow tube in which the air vibrates to create a sound of a definite pitch. ... must be the loudest musical instrument, unless you count electric amplification. ... However, you could argue that more sensitive movements of the mouth etc. are ... there were often built by the same person or company that built the church clock.
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Chapter 1 History and Development of Mechanical Vibration Therapy's website is neilhawes.com