DE3663554D1
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1989-06-29
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GB2216569B
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1991-12-18
Method and apparatus for downhole chromatography
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1991-02-20
Method and apparatus for setting an underwater drilling system
EP0226226A3
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1988-08-24
Method and apparatus for floating point operations
EP0151526A3
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1986-09-17
Method of and apparatus for soil stabilisation
EP0261825A3
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1989-08-23
Method and apparatus for acoustic logging of boreholes
DE3372391D1
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1987-08-13
Method and apparatus for drilling
ZA88413B
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1988-07-06
Method of excavation and apparatus therefor
DE3362403D1
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1986-04-10
Method and apparatus for earth drilling
GB2156877B
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1988-02-10
Method and apparatus for the subsequent underground sealing of dumps
GB2140845B
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1986-09-03
Method and apparatus for constructing an enlarged tunnel
ZA837482B
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1985-02-27
Method and apparatus for fracturing of rock
GB2131063B
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1985-07-24
Method of and apparatus for retaining earth formations
GB2124278B
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1985-11-06
Earth drilling apparatus and method
GB2192920B
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1990-01-17
Method of excavation and apparatus therefor
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1983-03-23
Method and apparatus for drilling and mining
ZA835245B
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1984-08-29
Earth drilling apparatus and method
DE3761030D1
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1989-12-28
Method of and apparatus for providing an underground tunnel
GB2152558B
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1986-12-17
Mining method and apparatus
PL256731A2
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1987-03-23
Method of and apparatus for obtaining asphalt
PL255104A1
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1987-05-18
Method of and apparatus for digging narrow trenches
PL251532A1
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1986-07-15
Method of and apparatus for mining filled longwalls
BG47295A1
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1990-06-15
Method and device for making of underground stopes
GB2187223B
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1989-11-08
Process and device for tunnel drilling reconnaissance
GB2196906B
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1991-04-03
Method and apparatus for locating an object