OCTOBER 31, 2017, BY CONTRIBUTED BY: ELEANOR MAHONEY During the late nineteenth and the early twentieth century, Philip Bell Downing successfully filed at least five patents with the United States Patent Office. Among his most significant inventions were a street letter box (U.S. Patent numbers 462,092 and 462,093) and a mechanical device for operating street railway switches (U.S. Patent […]

PHILIP B. DOWNING (1857-1934)