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Who invented the rear parking sensor?

The first rear proximity sensor system, a reversing radar, was introduced first on the 1976 Chevrolet Impala and Cadillac Fleetwood as Cadillac Cruise Control or Speed Alert, an option that utilized dual ultrasonic wave transducers set into both sides of the vehicle’s rear fascia to warn the driver if the automobile was coming within approximately one to eighteen feet of an unseen fixed obstruction when backing