Modem connection, signal, interference:
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General noise, Office work
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Turn on, turn off the hard drive
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Franking machine
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Matrix printer
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Opening, closing the laptop cover
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Manual copy machine
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Computer noise, Communication room
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Typewriter, Office work, environmental sounds
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Computer interface, signals
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Shutting, fan noise, Turning on the laptop
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Opens, closes the CD / DVD tray
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Interference, Modem connection, signal
★★★★★