Opens, closes the CD / DVD tray:
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Office work, environmental sounds, typewriter
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Computer simulated laser
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Repeatedly pressing a computer mouse
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Matrix printer
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Floppy disk reading
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Jet printer
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Turn off the hard drive, Turn on
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Old computer keyboard
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Computer keyboard
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Turning on the laptop, fan noise, shutting
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Bios, Sound signal of a bios computer
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Computer interface, signals
★★★★★