GB0026073D0
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Improvements in or relating to preform cutting elements for rotary drill bits
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GB9906511D0
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Improvements in or relating to cutting structures for rotary drill bits
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US6116355A
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Choke device
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GB9623032D0
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A downhole unit for use in boreholes in a subsurface formation
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GB9621216D0
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Improvements in or relating to cutting structures for rotary drill bits
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GB9621217D0
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Improvements in or relating to preform cutting elements for rotary drill bits
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GB9619486D0
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Improvements in or relating to elements faced with superhard material
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GB9617520D0
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Improvements in or relating to elements faced with superhard material
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GB9616620D0
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Improvements in or relating to rotary drill bits
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GB9609659D0
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Automatically steered drill assembly
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GB9608732D0
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Improvements in or relating to rotary drill bits
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GB9608172D0
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Improvements in or relating to cutting elements for rotary drill bits
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US5788001A
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Elements faced with superhard material
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GB2331538A
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Improvemnts in or relating to elements faced with superhard material
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GB9603402D0
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Improvements in or relating to rotary drill bits
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GB9817935D0
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Improvements in or relating to steerable rotary drilling systems
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GB9602754D0
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Improvements in or relating to the surface finishing of components used in subsurface drilling
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GB9600758D0
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Improvements in or relating to rotary drill bits
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GB9801900D0
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Improvements in or relating to rotary drill bits
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GB9521972D0
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A drilling assembly for drilling holes in subsurface formations
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