Photocopy (photocopy):
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Disc read, CD / DVD drive
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Signals, Computer interface
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Manual copy machine
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Room noise, Hard disk, write, read
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Laser printer
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Turning on the laptop, fan noise, shutting
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Old computer keyboard
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Computer mouse movement
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Input error sound, Pressing a keypad
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Interference, signal, Modem connection
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Turn on, turn off the old computer
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Computer simulated laser
★★★★★