Laser printer:
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Closes the CD / DVD tray, Opens
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Computer keyboard
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Floppy disk reading
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The USB flash drive is inserted, removed
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Disc read, CD / DVD drive
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Computer interface, signal read information
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Franking machine
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Laser printer
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Matrix printer
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Read, room noise, Hard disk, write
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Computer noise, Communication room
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Double click computer mouse
★★★★★