In the first of the resulting arbitration hearings in Stockholm MOR lawyers did not dispute Russian documents that showed Luzhkov's signature approving the original decree calling for the plant or the existence of a 1995 signed contract between Sapir and MOR's general director.

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Mr. Zuckerberg said the second page of that contract, which has his signature, is authentic.

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Even so, we are very disturbed by the possibility of identical duplication, whether of a signature on a law, a check, a contract, or an artwork.

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And it was on hand at the early stages of rebuilding, as it won a contract to put up steel for the site's signature tower, One World Trade Center, in 2006.

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