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Which of these African-American inventors developed a shoe-manufacturing machine that significantly cut shoe prices in the United States?

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heavenwaterfall
Jan Matzeliger invented the shoe-producing machine that could finish from 100-650 more shoes (each day) than by hand. This made shoe production a factory (rather than hand-made) product. 
lindasamuels

Jan E. Matzeliger developed a shoe-manufacturing machine that significantly cut shoe prices in the United States.