In a 13, the United States before the Dirac in August 1859, drilling into a 21.69 m-deep wells, but only from the wells produced more than 1.8 tons of oil wells.

• 再过13年之后，美国的狄拉克才于1859年8月，钻成一口21.；69米深的井，而且只从井里采出1