Computer interface, signal read information:
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Environmental sounds, Office work, typewriter
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Computer mouse movement
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Turn off the old monitor, Turn on
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Computer interface, signal read information
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Franking machine
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Floppy disk reading
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Sound signal of a bios computer, bios
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Signals, Computer interface
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Laser printer
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Matrix printer
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Turn on, turn off the hard drive
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Computer simulated laser
★★★★★