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to drill Pennsylvania's first oil well in 1859 using small steam engines to power the drilling process rather than by human muscle. Cable tool drilling was developed in ancient China and was used for drilling brine wells. The salt domes also held natural gas, which some wells produced and which was used for evaporation of the brine. Drake learned of cable tool drilling from Chinese laborers in the U.S. The first primary product was kerosene for lamps and heaters. Similar developments around Baku

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