HYDRAULIC SUPPLY DEVICE FOR A ROTARY-PERCUTANT DRILLING APPARATUS
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DRILLING DEVICE
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Process and apparatus for controlling drop stroke of a percussion apparatus moved by an under pressure incompressible fluid.
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DRILLING AND BOLTING APPARATUS FOR DIGGING AND SUPPORTING GALLERIES
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METHOD AND APPARATUS FOR REGULATING THE STRIKING STROKE OF A PERCUSSION APPARATUS MOUSED BY AN INCOMPRESSIBLE PRESSURE FLUID
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DEVICE FOR HOLDING THE TOOL OF A HYDRAULIC ROCK BREAKER.
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HYDRAULIC PERCUSSION APPARATUS.
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HYDRAULIC DISTRIBUTOR FOR A PERCUSSION APPARATUS MOUSED BY AN INCOMPRESSIBLE PRESSURE FLUID
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Apparatus for unblocking and unscrewing drill-string elements
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METHOD FOR REGULATING THE PERCUSSION PARAMETERS OF THE STRIKE PISTON OF AN APPARATUS MOVED BY AN INCOMPRESSIBLE PRESSURE FLUID, AND APPARATUS FOR CARRYING OUT SAID METHOD
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PERCUSSION APPARATUS
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METHOD FOR CONTROLLING THE MOVEMENT OF THE IMPACT PISTON OF A PERCUSSION APPARATUS MOUSED BY AN INCOMPRESSIBLE PRESSURE FLUID, AND APPARATUS FOR IMPLEMENTING THE METHOD
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DEVICE FOR ANALYZING THE OXYGEN CONTENT OF THE ATMOSPHERE OF AN OVEN, IN PARTICULAR FOR STEEL HEAT TREATMENT
