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System for the initiation of downhole explosive and propellant systems
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ZA8203019B
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High pressure rotary coupling
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Process for solution mining
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Method of in-situ retorting of carbonaceous material for recovery of organic liquids and gases
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Gauge for measuring the mouth opening displacement of fracture toughness test specimens
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Active drill stabilizer assembly
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Method for determining plane strain fracture toughness of non-elastic fracture mechanics specimens
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Constant point of load application fracture specimen loading machine
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Failsafe hydraulic prestressing nut
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Process for measuring the fracture toughness of rock under simulated down-hole stress conditions
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Solar illuminated energy conserving greenhouse
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Method for measuring plane strain fracture toughness
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Fracture specimen loading machine
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Process for direct measurement of the orientation of hydraulic fractures
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