Matrix printer:
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Computer interface, signals
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Computer keyboard
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Removed, The USB flash drive is inserted
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Franking machine
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Photocopy (photocopy)
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Shutting, Turning on the computer, fan noise
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Computer simulated laser
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Double click computer mouse
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Opens, disc read, closes the CD / DVD tray
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Repeatedly pressing a computer mouse
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Room noise, Hard disk, write, read
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Bios, Sound signal of a bios computer
★★★★★