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824 Drilling and Well Completions<br />

Figure 4-1 78. Pressure drop across underreamer (rock-type or drag-type<br />

underreamer with one nozzle). (Courtesy Smith International, Inc.)<br />

Figure 4-179. Pressure drop across underreamer (rock drilling underreamer<br />

with three nozzles). (Courtesy Smith International, Inc.)

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