Gulf Oil was a major global oil company from the 1900s to the 1980s. The eighth-largest American manufacturing company in 1941 and the ninth-largest in 1979, Gulf Oil was one of the so-called Seven Sisters oil companies. Gulf was one of the chief instruments of the legendary Mellon family fortune; both Gulf and Mellon Bank had their headquarters in Pittsburgh, Pennsylvania. Gulf\s former headquarters, originally referred to as \"the Gulf Building\" (now the Gulf Tower office condos), is an art-deco skyscraper. The tallest building in Pittsburgh until 1970, when it was eclipsed by the U.S. Steel building, it is capped by a \"step pyramid\" structure several stories high. Until the late 1970s, the entire top was illuminated, changing color with changes in barometric pressure to provide a weather indicator that could be seen for many miles. Gulf Oil Corporation (GOC) ceased to exist as
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