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This invention describes an automated machine designed to clean shopping carts. Carts first enter a vacuum stage where forced air blows loose trash off the cart, and a suction system then pulls the air and debris away. After this, the cart moves through a cleaning stage using various liquids and then a drying stage, making it ready for reuse. The claims specifically detail the forced air and suction components of the initial debris removal, including a blower, vent, duct, and suction motor.
Why it matters: Filed before modern microcontrollers made complex automation affordable. The control logic for sequencing stages and operating doors is now much simpler and cheaper to implement.
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