Injection device for pressurised cement suspension
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Kelly bar drill
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Process for the production of heavy-duty drill pipes
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Holding device for supporting drilling rods
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Mounting apparatus for dual drill pipe.
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Underground horizon boring tool with directional control
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Hydraulic striker hammer fixed to drill rod for earth drilling
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Fluid operated hammer
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Hydraulic striker hammer mechanism
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Hydraulic hammer
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Drilling apparatus with telescopic kelly bar
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Pneumatic hammer
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Drilling bit mounting for boring large holes - has clamp within drilling tube with radial expansion against eccentric type carrier
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Mobile boring rig
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Apparatus for superimposing drilling.
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AIR HAMMER
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Injection method of underground mineral extraction - using drill string with injection head used as drill bit, and flushing up loosened material from deposit to top of drill string
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Earth drilling rig
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CONTROL DEVICE FOR SWITCHING A HYDRAULIC SWITCHING MOTOR TO A BASE LOAD MOTOR
