Modem connection, signal, interference:
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Photocopy (photocopy)
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Opens, disc read, closes the CD / DVD tray
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Franking machine
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Computer mouse movement
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Turn off the old computer, Turn on
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Office work, environmental sounds, typewriter
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Floppy disk reading
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Double click computer mouse
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Jet printer
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Read the, Insert the disk into the drive
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Matrix printer
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Turn off the hard drive, Turn on
★★★★★