| http://www.w3.org/ns/prov#value | - Additionally, the flow tube 1910, which is preferably constructed of a relatively hard material such as ceramic, tungsten carbide, or PDC, is relatively thin (i.e., has a low thickness, as measured from an outer diameter to an inner diameter of the flow tube 1910) to facilitate drillability of the flow tube 1910 when a cutting structure, such as an earth removal member attached to a casing or a dr
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