Background
The World Trade Center was built using prefabricated parts which were bolted or welded together at the site. This process dramatically reduced construction time and costs. Using this process, t-beams and other types of cross beams were created and used in each of the World Trade Center buildings. When the Twin Towers collapsed, it sent debris down on to 6 World Trade Center, and gutted the interior of World Trade Center 6. In the midst of the WTC6 debris was this intact cross beam, which its discoverer believes came from the North Tower.
Read more about this topic: World Trade Center Cross
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