Computer interface, alarm:
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Communication room, computer noise
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Matrix printer
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Read the, Insert the disk into the drive
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Old computer keyboard
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Closing the laptop cover, Opening
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Disc read, CD / DVD drive
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Repeatedly pressing a computer mouse
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Photocopy (photocopy)
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Hard disk, read, write, room noise
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Laser printer
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Computer mouse click
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Turn off the hard drive, Turn on
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