Old computer keyboard:
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Signal, interference, Modem connection
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Photocopy (photocopy)
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Double click computer mouse
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Disc read, CD / DVD drive
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Pressing a keypad, input error sound
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Laser printer
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Read, write, Hard disk, room noise
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Manual copy machine
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Franking machine
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Computer simulated laser
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Turn off the old monitor, Turn on
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Fan noise, shutting, Turning on the laptop
★★★★★