The Vision SLR was introduced tot he world public in 1999, at the IAA in Frankfurt as a concept study of a supercar.

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Equipped with an 8-cylinder mid-engine, a car body made of carbon fibre, and doors hung on the A-pillar, the vision disposed of all the details which make a sports car, a supercar. Six years later the vision became reality, in the form oft he Mercedes-Benz SLR McLaren.

Source: Mercedes-Benz.tv