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Precision machinery—typically robotic arms, actuators, or motorized components—that automatically follows or "serves" a commanded input with extreme accuracy and responsiveness. The key is feedback: a sensor constantly measures the output (like position, force, or velocity) and a controller corrects any error between the command and the actual performance. This creates machines that aren't just powerful, but exquisitely delicate and obedient, capable of tasks requiring micron-level precision or adaptive force. They are the digital muscles of automation.
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