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US3604718A
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Tong assembly for drill pipes
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CA876536A
|
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Tong assembly for drill pipes
|
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US3473618A
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Rotary-percussion drill apparatus
|
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US3509953A
|
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Spade bit
|
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|
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Selectively vented connectors for percussion bits
|
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CA854056A
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Joint for double-walled drill pipe
|
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US3329401A
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Apparatus for recovering drill pipe
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FR1482457A
|
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Apparatus and method for digging a borehole by percussion drilling
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GB1133744A
|
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Improvements in drill pipe raising apparatus
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GB1133742A
|
|
Improvements in drill bits
|
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GB1133743A
|
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Improvements in drill pipes
|
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GB1133741A
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Improvements in and relating to drilling of earth formations
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Earth coring punch and drive apparatus therefor
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US3280925A
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Method and apparatus for impact drilling of overburden
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CA747776A
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Apparatus for recovering drill pipe
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CA851048A
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Spade bit
|
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CA758467A
|
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Method and apparatus for impact drilling of overburden
|
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CA780735A
|
|
Earth coring punch and drive apparatus therefor
|
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CA857170A
|
|
Double walled concentric drill pipe
|
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CA857740A
|
|
Selectively vented connectors for percussion bits
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