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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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Drilling Bits and Downhole Tools 821<br />

Rock Typre<br />

Underreamer<br />

Rock-Drtiftng<br />

Type<br />

Underreamer<br />

Underreamer<br />

Figure 4-1 74. Types of underrearners. (Courtesy Smith International, Inc.)

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