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Fazlur Rahman Khan (, Fazlur Rôhman Khan; 3 April 1929 - 27 March 1982) was a Bangladeshi-American structural engineer and architect who initiated important structural systems for skyscrapers. Considered the "father of tubular designs" for high-rises, Khan was also a pioneer in computer-aided design (CAD). He was the designer of the Sears Tower, since renamed

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