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Show . v - A Woman's Invention. Exchange. It was a woman who invented the system of signaling with colored lights now used on iana ana sea an over tne world, sue is .Mrs. Martha J. Costum of Washington. Her code was of great value to the government govern-ment during the war, and since then it has been used in other departments, notably the life saving service. Her signals have been adopted by the principal European governments govern-ments and she has received many honors from royalty. . a . 1 |