Taken from the World Trade Center Register, this is a list of WTC tenants that worked in the areas of engineering and construction.
Engineering Services
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America Bureau of Shipping (Floor 91 North Tower)
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EQE International (Floor 52 North Tower)
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Gibbs & Hill (Floor 91 South Tower)
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John J. McMullen Assoc. Inc. (Floor 15 South Tower)
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Mancini Duffy (Floors 15 and 22 South Tower)
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Raytheon Engineers & Construction (Floor 93 North Tower)
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Washington Group Intl. (Floor 91 South Tower)
General Contractors
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Deerpath Construction of New York (South Tower)
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IBN Group (North Tower)
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Regional Alliance Small Contractors (Floor 38 North Tower)
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Turner Construction Co. (Floor 38 North Tower)
Photo courtesy of the Federal Emergency Management Agency (FEMA), Washington, D.C.