os;s tallest buildings use it including:
             • The World Trade Center Towers (1350 ft)
             • The Standard Oil of Indiana Building (1125 ft)
             • The John Hancock Center (1105 ft)
             On February 13, 1975, a fire set by a custodian turn arsonist, started on the 11th floor and spread to limited portions of six floors, burning for three hours. Several fire suppression systems that were later installed in the Towers were not present at the time, including sprinkles, elevator shaft dampers, and electrical system fireproofing.
             The fire, which broke out just before midnight, did not kill anyone but
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