Black Fact = 1923 (Nov.20) – Garrett A. Morgan patented the Traffic Signal on this date in 1923. This three-way signal completely changed traffic control and was sold to General Electric for $40,000. Patent # 1,475,024. #theraydiotwins
Black Fact= (1893) Dr. Daniel Hale Williams
Black Fact = 1893(July 9) – Dr. Daniel Hale Williams performed the world’s first successful open-heart surgery without anesthesia at Provident Hospital in Chicago, IL, ...