Which of the following was the first to reduce the amount of labor hours required to make a product in the 20th Century?

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The assembly line was the first to reduce the amount of labor hours required to make a product in the 20th Century. Although originally discussed prior to the 20th Century, Henry Ford was first to master and benefit from an organized assembly line with the production of Ford's Model T cars.

Which of the Following Was the First to Reduce the Amount