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Today in Black History: David Crosthwait, Jr.

Born in Nashville, Tennessee, on May 27, 1898, David Nelson Crosthwaite Jr. studied mechanical engineering at Purdue University before taking a job with the C.A. Dunham Company (now Dunham-Bush, Inc.). At Dunham, Crosthwait conducted innovative research, and designed the heat system for Rockefeller Center and Radio City Music Hall. He held 119 patents—39 in the

 
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