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Lightweight fiberglass feed leg for hand-held pneumatic percussion rock drills

Zeta potential control for simultaneous enhancement of penetration rates and bit life in rock drilling

Abrasive-enhanced water-jet drill for hard rocks

Zero-surface-charge-controlled drilling for enhanced penetration and extended bit life

Published Year

• 1980-1989 (4) *

Subject

• Rock-drills (4) *
• Boring (1)
• Boring--Equipment and supplies (1)
• Directional drilling (1)
• Drilling muds--Testing (1)
• Hydraulic mining (1)
• Jet cutting (1)
• Sand-blast (1)
• Zeta potential (1)

Author

• Engelmann, William H. (2)
• Pahlman, J. E. (2)
• Tuzinski, Patrick A. (2)
• Watson, Pamela J. (2)
• Krawza, W. G. (1)
• Savanick, G. A. (1)
• Spencer, Ellsworth R. (1)

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