Opening, closing the laptop cover:
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Photocopy (photocopy)
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Alarm, Computer interface
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Franking machine
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Old computer keyboard
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Jet printer
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Room noise, write, read, Hard disk
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Turning on the computer, fan noise, shutting
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Matrix printer
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Computer interface, signals
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Insert the disk into the drive, read the
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Removed, The USB flash drive is inserted
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Computer interface, signal read information
★★★★★