Opens, closes the CD / DVD tray, disc read:
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Jet printer
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Matrix printer
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Franking machine
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Manual copy machine
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Shutting, fan noise, Turning on the computer
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Signal read information, Computer interface
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Computer keyboard
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The USB flash drive is inserted, removed
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Office work, general noise
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Alarm, Computer interface
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Typewriter, environmental sounds, Office work
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Disc read, closes the CD / DVD tray, Opens
★★★★★