Modem connection, signal, interference:
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Closing the laptop cover, Opening
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Photocopy (photocopy)
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Fan noise, shutting, Turning on the computer
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Floppy disk reading
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Jet printer
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Matrix printer
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Turn on, turn off the old monitor
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Computer simulated laser
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Turn on, turn off the old computer
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Franking machine
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Read the, Insert the disk into the drive
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Office work, general noise
★★★★★