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Ehen the trees mature their bark can be harvested every 9 years without harm. This series of photographs shows, from havest to finished product, the process of making a cork for a bottle. I expected the process to be automated, but it looks like it is very labor intensive.
I found them at Visboo's post Production of Corks. There are more pictures after the jump, and of course even more at the Visboo link.