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Title:
DRILLING DEVICE AND METHOD OF CORRECTING DIRECTION OF DRILLING
Document Type and Number:
Japanese Patent JPS61176790
Kind Code:
A
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Inventors:
TAKASU MOTOYUKI
Application Number:
JP1548985A
Publication Date:
August 08, 1986
Filing Date:
January 31, 1985
Export Citation:
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Assignee:
TOKYU KENSETSU KK
International Classes:
E21B7/10; E21B7/00; E21B7/06; (IPC1-7): E21B7/06
Domestic Patent References:
JPS55148886A1980-11-19
JPS556148A1980-01-17
Attorney, Agent or Firm:
Sakuo Yamaguchi



 
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