The Indian Territory Illuminating Oil Company, also known as ITIO, traces its roots back to 1895 when Edwin B. Foster secured a vast lease covering the Osage Nation reservation in present-day Osage County, Oklahoma. Under the leadership of Henry V. Foster, the company divided the lease into blocks and subleased them, eventually becoming a major player in the oil industry.
In 1903, Theodore N. Barnsdall acquired a majority stake in ITIO, leading to further success and expansion into areas like Seminole, Oklahoma. The company made significant contributions to the oil industry, including the discovery of the Oklahoma City Oil Field in 1928, before eventually merging its operations with Cities Service Company.
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