CD / DVD drive, disc read:
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Franking machine
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Turn on, turn off the old monitor
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Communication room, computer noise
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Repeatedly pressing a computer mouse
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Signals, Computer interface
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Office work, general noise
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Interference, signal, Modem connection
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Matrix printer
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Computer mouse movement
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Double click computer mouse
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Read, Hard disk, write, room noise
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Sound signal of a bios computer, bios
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