GB9221453D0
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Improvements in rolling cutter drill bits
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GB9218100D0
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Improvements in or relating to rolling cutter drill bits
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GB9102258D0
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Rotary drill bits and methods of designing such drill bits
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GB9100874D0
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A drilling system and method for controlling the direction of holes being drilled or cored in subsurface formations
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US5109935A
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Rotary drill bits
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GB9024291D0
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Improvements in or relating to cutter assemblies and cutting elements for rotary drill bits
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GB9019914D0
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Improvements in or relating to the manufacture of cutting structures for rotary drill bits
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CA2022495A1
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Nozzle means for rotary drill bits
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GB9015704D0
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A drilling system and method for controlling the direction of holes being drilled or cored in subsurface formations
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GB9002963D0
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Improvements in cutting elements for rotary drill bits
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GB8926689D0
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Improvements in or relating to rotary drill bits
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GB8926688D0
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Improvements in or relating to rotary drill bits
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GB8925409D0
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Improvements in or relating to cutting elements for rotary drill bits
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GB8925408D0
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Improvements in or relating to cutter assemblies and cutting elements for rotary drill bits
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US4969378A
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Case hardened roller cutter for a rotary drill bit and method of making
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GB8917878D0
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Improvements in or relating to cutting elements for rotary drill bits
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IE892093L
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Rotory drill bit
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EP0352895A2
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Cutting elements for rotary drill bits
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IE891073L
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Rotary drill bit
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US4940099A
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Cutting elements for roller cutter drill bits
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