Charles Day (engineer)
American engineer (1879–1931) / From Wikipedia, the free encyclopedia
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Charles Day (May 15, 1879 – May 10, 1931)[1][2] was an American electrical, construction and consulting engineer, and co-founder of Day & Zimmermann. He is known as a specialist in public utility management and operation,[3] and for his seminal contributions to flow charts[4] and the routing diagram.[5]