Title:
【発明の名称】掘削装置
Document Type and Number:
Japanese Patent JP2729940
Kind Code:
B2
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Inventors:
NAKANO TATSUO
FUJII MASATSUGU
FUJII MASATSUGU
Application Number:
JP14006389A
Publication Date:
March 18, 1998
Filing Date:
May 31, 1989
Export Citation:
Assignee:
TAKENAKA KOMUTEN KK
International Classes:
E21B10/32; E21B7/28; E21B7/30; E21B10/44; (IPC1-7): E21B10/32; E21B7/28; E21B7/30
Attorney, Agent or Firm:
Hideo Fujimoto