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Robert Gable, a retired psychologist, in the garden of his home in Berkeley, Ca., on Friday, Oct. 29, 2010. Mr. Gable and his twin brother, Kirk, not pictured, invented the electronic monitoring device as graduate students at Harvard University. The invention was intended for positive re-enforcement that monitored and, and later rewarded, the offender for attending classes, sessions or a job. As technology improved, the belt was then used more as a tool for punishment.