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Christmas tree (oil well) - Wikiwand
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Christmas tree (oil well) - Wikiwand
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http://www.wikiwand.com/en/Christmas_tree_(oil_well)
Category:
Sports Shoes Boots moreFur Garment
In petroleum and natural gas extraction, a Christmas tree, or "tree" , is an assembly of valves, spools, and fittings used for an oil well, gas well, water injection ...
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