Blue Macaw—that's the exotic code name for one of General Motors Corp.'s most closely guarded secrets. It's an auto factory, possibly the most modern in the world, built near the town of Gravataf in the Brazilian state of Rio Grande do Sul. After a four-year incubation, Project Blue Macaw took wing on July 20, when Brazil President Fernando Henrique Cardoso and gm's top brass inaugurated the plant.
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