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My father works for Michelin Tire, and Tire companies do have testers - thier employees. They get very high discounts on tires from Michelin, 85-90% and they have to return the tires to michelin after thier useful life. Michelin evaluates the wear on the tire, and uses that as part of it's quality control system. That is a very large community. Many eyes find many problems, whatever the product.