crank balanced beam pumping unit jidong oilfield sunset scenery closeup photo |
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| navigate by keyword : china jidong oilfield pumping unit drilling petroleum machinery equipment night lights dark energy resources exploration mining industry space silhouette effect beautiful features background outline outdoor landscape nature environment underground rock formation earth 039 crust geology quiet busy site steel wire rope balance pulling force |
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| Crank balanced beam pumping unit in Jidong oilfield sunset scenery, Hebei Province, China, closeup of photo |
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