Hello Bruce,
Modern cruise control (also known as a speedostat) was invented in 1945 by a blind inventor and mechanical enineer Ralph Teetor. His idea was born out of the frustration of riding in a car driven by his lawyer, who kept speeding up and slowing down as he talked. The first car with Teetor's system was the Chryser Imperial in 1958. This system calculated ground speed based on driveshaft rotations and used a solenoid to vary throttle position as needed.
Mary
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