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1977-09-30
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1973-11-27
Method and apparatus for testing wells
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1976-08-24
Earth drilling apparatus and method
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1974-06-11
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1979-02-28
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IT1035390B
(it )
1979-10-20
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IL46371A0
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1975-03-13
Method and apparatus for drawing sandfree water from bored wells
FR2281490A1
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1976-03-05
Machine et procede de percement de tunnels
IT1053540B
(it )
1981-10-10
Metodo ed apparecchio per la ricerca di minerali nel sottosuolo
NO137021C
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1977-12-14
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ZA707850B
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1971-08-25
Methods and apparatus for testing offshore wells
ZA753748B
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1976-04-28
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1976-03-09
Well drilling apparatus and method
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1979-11-10
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IT1034898B
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1979-10-10
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IS2184A7
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1975-06-05
Aðferð og tæki til að þétta fóðringar í borholum
CA931071A
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1973-07-31
Method and apparatus for testing well formations
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1976-05-25
Method and apparatus for testing oil wells
CA999232A
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1976-11-02
Well casing apparatus for wells in permafrost and method for completing wells in permafrost
MY7800357A
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1978-12-31
Well logging apparatus and method
CA1034867A
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1978-07-18
Mining method and apparatus
AU478274B2
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1975-06-12
Method and apparatus for cement well bore casing
AU489417B2
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1976-05-06
drilling MUD DEGASSER APPARATUS AND METHOD
CA811018A
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1969-04-22
Method and apparatus for drilling straight wells
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1970-05-05
Method and apparatus for completing wells