Manual copy machine:
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Room noise, Hard disk, read, write
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Computer mouse click
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CD / DVD drive, disc read
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Communication room, computer noise
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Manual copy machine
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Removed, The USB flash drive is inserted
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Turn on, turn off the old monitor
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Jet printer
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Old computer keyboard
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Laser printer
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Shutting, fan noise, Turning on the laptop
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Computer interface, signals
★★★★★