We were grocery shopping the other day (with a car, which is a nice change from dragging all of the bags by hand down the NYC streets). As we rolled the shopping cart (known here as a trolley) from the supermarket to the car park we came to a conveyor escalator. As we entered the escalator, the trolley instantaneously magnetized to the ground surface to prevent a runaway trolley. Smart thinking.
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| Magnetic Caster |
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