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Comparison of Roomba 500 Series Robots | Robot Reviews
Amazon.com: Odashen Side Brush Motor Module for iRobot Roomba 500 600 700 800 900 I3 Series Robot Vacuum Cleaner (Replacement Motor Module + Side Brush +Screwdriver) : Industrial & Scientific
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iRobot Black Faceplate for 500 Series 85301 – Vacuum Direct
iRobot launches new Roomba 500 series robot vacuum cleaners. Puny earth dust stands no chance! - Tech Digest