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<p>North America, the first commercial oil well entered operation in <a href="page.php?w=Oil_Springs%2C_Ontario">Oil Springs, Ontario</a> in 1858, while the first offshore oil well was drilled in 1896 in the <a href="page.php?w=Summerland_Oil_Field">Summerland Oil Field</a> on the California Coast.</p>

<p>The earliest oil wells in modern times were drilled percussively, by repeatedly raising and dropping a bit on the bottom of a <a href="page.php?w=Drilling_rig">cable</a> into the borehole. In the 20th century, cable tools were largely replaced</p><p>
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