Manual copy machine:
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Computer interface, signals
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Office work, general noise
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Repeatedly pressing a computer mouse
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Closes the CD / DVD tray, disc read, Opens
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Disc read, CD / DVD drive
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Computer keyboard
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Fan noise, Turning on the laptop, shutting
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Double click computer mouse
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Manual copy machine
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Laser printer
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Signal, Modem connection, interference
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Matrix printer
★★★★★