Old computer keyboard:
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Computer interface, signals
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Turn off the hard drive, Turn on
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Floppy disk reading
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CD / DVD drive, disc read
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Repeatedly pressing a computer mouse
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Double click computer mouse
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Interference, Modem connection, signal
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Franking machine
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Fan noise, shutting, Turning on the computer
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Laser printer
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Jet printer
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Computer simulated laser
★★★★★