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See post #18 on the previous page:
It's a typical bar from the era when all sorts of aerodynamic experiments were done. In theory Scott figured that it would provide the rider with an aerodynamic position with a low torso and the arms close to the head tube. In reality it proved to be a platform to show that they sponsored Greg Lemond (the only rider in the European pro scene who used these bars, though I've never seen him actually use the extensions).
Is there a function to them other than more variety of hand positions?