Computer mouse click:
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Photocopy (photocopy)
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Computer mouse click
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Modem connection, interference, signal
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Turn off the old monitor, Turn on
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Signals, Computer interface
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Matrix printer
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Jet printer
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Bios, Sound signal of a bios computer
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Computer simulated laser
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General noise, Office work
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Laser printer
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Room noise, Hard disk, write, read
★★★★★