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1992-08-12
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1990-05-28
Directional drilling apparatus and method
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1989-04-26
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1993-07-30
Well logging apparatus and method
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1987-10-05
Hydraulic drilling apparatus and method
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1987-10-22
Hydraulic drilling apparatus and method
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1987-02-03
System and method for controlled directional drilling
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1990-10-31
Method and apparatus for controlling drilling operation
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1991-10-23
Drill and method for using the same
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1990-05-28
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1990-07-18
Construction apparatus and construction method
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1988-04-20
Drilling apparatus
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1992-01-15
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1989-02-22
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1997-11-12
Directional drilling method and apparatus
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1992-08-12
Calendering method and apparatus
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1989-12-13
Rock drilling apparatus and method
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1991-06-26
Logging apparatus and method
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1990-10-10
Method for boring hole in the ground and apparatus therefor
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1991-12-11
Method in rotary drilling and rotary drilling apparatus
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1991-04-28
Method and apparatus for drilling a tunnel
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1993-10-20
Drilling apparatus and method
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1991-04-28
Method and apparatus for drilling a tunnel
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1990-07-11
Assembly method and apparatus
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1990-07-25
Directional drilling apparatus and method