IBM engineer Leon Cooper helped develop MT/ST, the first electronic word-processing machine, beginning in the late 1950s. The Lexington-made product was launched 50 years ago. It allowed typists to store documents on magnetic tape like the one over his left shoulder. The tape could then be played back to type clean copies. Cooper, 86, is retired and still lives in Lexington. Photo by Tom Eblen | teblen@herald-leader.com

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