AU2887589A
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Reinforced rotary drill bit
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DE3628265A1
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Stabiliser for drilling strings
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DE3613265A1
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CORE DRILLING TOOL FOR STONE DRILLING
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DE3604270C1
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Drilling tool for deep drilling
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ZA8600556B
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Kerfing drag bit
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DE3543295A1
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Fishing tool for removing iron-bearing chips from deep-drill holes
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EP0163946A1
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Apparatus for optional straight or directional drilling underground formations
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DE3513124C1
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Chisel direct drive for deep drilling tools
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DE3513123C1
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Mechanical guillotine
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US4664205A
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Hydraulic inner barrel in a drill string coring tool
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EP0156264A2
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Multi-component cutting element using triangular, rectangular and higher order polyhedral-shaped polycrystalline diamond disks
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CA1224408A
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Device for delivering flowable material
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EP0156235A2
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Multi-component cutting element using consolidated rod-like polycrystalline diamond
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AU3946885A
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Cutting element using polycrystalline diamond disks
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US4643265A
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Core barrel apparatus for disposing a core within a thin, flexible film casing
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US4580643A
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Adjustable bearing section core barrel
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US4607710A
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Cammed and shrouded core catcher
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US4605075A
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Shrouded core catcher
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US4606416A
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Self activating, positively driven concealed core catcher
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US4603749A
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Apparatus for downward displacement of an inner tube within a coring barrel
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