“…It was in the late 1950's that compressive and tensile strengths were combined into drillability models. Shimomura and Takato (1958) conducted diamond drilling tests and concluded that the compressive and tensile strengths were related to the penetration rate.…”
“…It was in the late 1950's that compressive and tensile strengths were combined into drillability models. Shimomura and Takato (1958) conducted diamond drilling tests and concluded that the compressive and tensile strengths were related to the penetration rate.…”
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