| http://www.w3.org/ns/prov#value | - Thus, one such member may comprise a housing or case suspended from the lower end of the string, the other may comprise a hollow shaft rotatably supported by the case and having a bit on its lower end, and a motor, such as a turbine, may be disposed within the annular space between the case and a shaft for rotating the shaft and thus the bit without the necessity of transmitting torque from the su
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