| http://www.w3.org/ns/prov#value | - ubes or rods from the hole that is drilled into the groundObserve load variations on gauges, pumps, and pressure indicatorsInspect engines, rotary chains, and other equipment to detect faulty operations or unusual equipment conditionsDrive truck-mounted units to well sitesInstall pressure-control devices onto wellheadsThread cables through derrick pulleysOperate pumps that circulate water, oil, or
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