Lewis Latimer, a son of slaves, helped Alexander Graham Bell patent the first telephone, he also patented a carbon filament for the incandescent light bulb in 1881. Thomas Edison, up until Lewis came around, couldn't get a bulb to light for more then a few minutes.

Lewis Latimer, a son of slaves, helped Alexander Graham Bell patent the first telephone, he also patented a carbon filament for the incandescent light bulb in 1881. Thomas Edison, up until Lewis came around, couldn't get a bulb to light for more then a few minutes.

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