How has the oil field machinery changed?

Answer:
Aside from the demise of oil derricks, which have given way to pumping units, and the off-shore drilling methods used along the coast lines, the industry has not radically changed since its inception.
First answer by Ency. of US Industries. Last edit by Ency. of US Industries. Contributor trust: 18 [recommend contributor recommended]. Question popularity: 2 [recommend question].

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