10 / 14
9
Edison also invented a rechargeable
battery. He used it to make a
mining helmet with a light on it.
Miners wore the helmets. They
could see in the dark mines.
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10 / 14
10 / 14
9
Edison also invented a rechargeable
battery. He used it to make a
mining helmet with a light on it.
Miners wore the helmets. They
could see in the dark mines.