| http://www.w3.org/ns/prov#value | - After all the casing sections A, B, C, etc. have been cemented in place, and the drill pipe P and running tool 37, 42 removed, a suitable size drill bit (not shown) is secured to the string of drill pipe and is lowered in the well bore D, the drill pipe being rotated to drill out the internal mechanisms of all the shoes and other obstructions that might have been incorporated in the casing strings
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