PL249995A1
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1985-07-16
Method of regeberating drilling slurry and apparatus therefor
DE3461994D1
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1987-02-19
Drilling tool and method of making it
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1984-06-27
Method and apparatus for forming and using a bore hole
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1986-10-22
Method and apparatus for borehole logging
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1991-06-12
Method and apparatus for measurement of azimuth of a borehole while drilling
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1989-08-23
Method and apparatus for acoustic logging of boreholes
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1989-10-18
Method and apparatus for investigating drilling conditions in a borehole
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1987-01-21
Method and apparatus for hole coldworking
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1993-04-07
Method and apparatus for measurement of azimuth of a borehole while drilling
EP0196567A3
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1987-10-14
Apparatus and method for monitoring the operating condition of a drill bit
AU8203287A
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1988-04-14
Improved drilling method and apparatus
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1989-11-16
Method and apparatus for hole coldworking
EG17649A
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1990-06-30
Method and apparatus for controlling the ratational turque of a drill bit
DE3468477D1
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1988-02-11
Borehole logging and work-over method and apparatus
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1987-08-13
Method and apparatus for drilling
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1993-04-07
Method and apparatus for logging a borehole
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1984-09-27
Improved drilling method and apparatus
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1986-04-10
Method and apparatus for earth drilling
DE3568818D1
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1989-04-20
Lateral hole boring method and apparatus
IL76728A0
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1986-02-28
Apparatus and method for laser drilling
GB2147642B
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1986-10-15
Drilling apparatus and methods
ZA846628B
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1985-04-24
Method of and arrangement for positioning of a drilling apparatus
ZA888410B
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1989-08-30
Drill hole filling method and apparatus
GB2076039B
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1983-12-14
Apparatus for and method of signalling within a borehole while drilling
ZA837738B
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1985-02-27
Method and apparatus for lubricating a drill bit