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8 April, 20:32

What did the trained engineer and son of former slaves elijah mccoy invent to improve railroad efficiency?

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  1. 8 April, 20:52
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    a method to automatically lubricate gears

    While working for a railroad McCoy invented a lubrication device to make railroad operation more efficient. McCoy trained as an engineer in Scotland as a teenager. He showed a strong interest in mechanics from a young age
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