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Telesensors, teleoperators, and telecontrols are words defining sensory systems, electromechanical operators, and controls systems operated by man from a distance. Because of the increasing demand for equipment that can give man the ability to operate in hostile environments, operating from a distance is now a major need. Remotely operated systems can provide this capability if they satisfy the following three functional requirements. They must provide the human operator with a high level of ability to do complex non-routine operations in remote locations, provide the human operator with a real sense of presence at the remote location, and provide the human operator with real time information concerning operations in the remote environment. When we review the state of the art, we find that most available equipment is inadequate. Although most remotely operated equipment does not now comply with the three functional requirements listed, enough work has been done so that additional work can result in systems that will meet these tests. Furthermore, it is probable that the technology developed will be useful in other applications such as equipment for the rehabilitation of the handicapped.