CD / DVD drive, disc read:
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Interference, signal, Modem connection
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Jet printer
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Computer keyboard
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Computer simulated laser
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Computer interface, alarm
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Matrix printer
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Disc read, CD / DVD drive
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Office work, general noise
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Insert the disk into the drive, read the
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Manual copy machine
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Repeatedly pressing a computer mouse
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Office work, environmental sounds, typewriter
★★★★★