George Stibitz's Bell Labs Relay Interpolator is Possibly the First Electromechanical Computer to Run Programs in the U.S.

George Stibitz circa 1940.

George Stibitz circa 1940. Computer History Museum.

In September 1943 the Bell Labs Relay Interpolator (later called the Model II) was operational for the first time. Using programs from punched tape, the Relay Interpolator, which used 440 relays, was possibly the first electromechanical computer to run programs in the United States. 

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