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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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Ultrasound
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INFOTEXT
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1992-09-02
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234b
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8 lines
Ultrasound is the pressure waves similar in
nature to sound waves but occurring at
frequencies above 20,000Hz (cycles per
second), the approximate upper limit of human
hearing (15-16Hz is the lower limit).
Subject by: Shaun Jay