Laser printer:
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CD / DVD drive, disc read
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Signals, Computer interface
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Repeatedly pressing a computer mouse
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Signal read information, Computer interface
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Turn on, turn off the old monitor
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Turning on the computer, fan noise, shutting
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Bios, Sound signal of a bios computer
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Manual copy machine
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The USB flash drive is inserted, removed
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Photocopy (photocopy)
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Read the, Insert the disk into the drive
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Modem connection, interference, signal
★★★★★