Photos of Campagnolo's Cambio Corsa derailleur, courtesy of reader Richard Bryne. The special toothed dropouts allowed the rear wheel to remain aligned in the frame while it moved forward and backward to take up slack in the chain.  For more on the Cambio Corsa, click here.
 
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Two levers--one released the rear wheel, the other shifted the chain. Special dropouts meshed with teeth on the rear axle. Note the long dropouts. As on a fixed gear bicycle, the wheel moved to take up slack in the chain. Rear view The entire assembly.

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