| http://www.w3.org/ns/prov#value | - al heat, 4) line pipe designed and used principally for conveying gas, oil and liquified petroleum products, water and slurries, 5) oil-country tubular goods, a collective term applied in the oil and gas industries to the three kinds of pipe used in wells, namely casing, drill pipe and tubing, 6) rigid conduit used for the production of electrical wiring systems and 7) mechanical tubing used for a
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