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Tokyo, JP
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Patent Grant
Hydraulic test system mounted with borehole television set for simu...
Patent number
5,767,400
Issue date
Jun 16, 1998
Doryokuro Kakunenryo Kaihatsu Jigyodan
Katsushi Nakano
E21 - EARTH DRILLING MINING
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Patent Grant
Low-water-pressure controlled hydrologic test method
Patent number
4,986,120
Issue date
Jan 22, 1991
Doryokuro Kakunenryo Kaihatsu Jigyodan
Koichi Yanagisawa
E21 - EARTH DRILLING MINING
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