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Black History Month

Across
Assisted in the survey of the original boundaries of the District of Columbia - 1791
Invented the ironing board
Invented a shoe making machine that revolutionized shoe making.
First African American department chair at Harvard Medical School
Performed the first successful open heart surgery in US.
First to prove that insects can hear
Down
First Black president fo the American Psychological Association.
First African-American to receive a Ph.D in any subject in physics from Yale University 1876
Invented thermal cooling systems for trucks.
First African American to work as a professionally trained nurse
First African-American woman to receive a patent for a medical invention.
Designed a long-distance flight airplane, displayed at the 1911 First Industrial Air Show
Invented early spark plug
First African-American woman to receive a patent for a web-based software invention.
Discovered my uses to the peanut including dyes, plastics, and gasoline.