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Figure 2 - Robots at the tipping point: the road to iRobot Roomba

Rug Warrior was an early floor-cleaning robot. It possessed a simple carpet sweeping mechanism for cleaning, a full coverage bump sensor to allow escape from collisions, and drive wheel-mounted shaft encoders that enabled the robot to follow a simple cleaning pattern. A behavior-based program running on a low-cost microprocessor controlled the robot.
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