New drillbit offerings keep pushing the envelope
Fischer, Perry
New drillbit offerings keep pushing the envelope - oct. 2009 - 4 p. ; 45-48
Transcripción del resumen del autor. Improvements in hardness and durability have yet to approach a limit. Even roller-cone bits are being improved with new metallurgy.
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New drillbit offerings keep pushing the envelope - oct. 2009 - 4 p. ; 45-48
Transcripción del resumen del autor. Improvements in hardness and durability have yet to approach a limit. Even roller-cone bits are being improved with new metallurgy.
10
