It was through racing, for instance, that Mazda discovered a gear box problem with the MX-5 Miata.

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But Folz defines it to include not only the skeleton of the car but also the engine, the gear box, the transmission and the suspension.

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After the show, Volkswagen promised action, and a spokesman said the following Monday that the company would recall both locally-made and imported cars using the gear box.

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There, among 12-foot high stacks of old oscilloscopes and signal-conditioning gear, Williams points to a clunky black metal box about the size of an underwear drawer.

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Back on the stretch of freshly paved road, the team's ironmonger wiped his sweaty palms on his thick leather apron, then retrieved a lunch box from the bullock-cart piled with welding gear and scrambled up the slope to get a better view of the proceedings.

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