Title:
二重管掘削装置
Document Type and Number:
Japanese Patent JP4773868
Kind Code:
B2
Inventors:
Tanigaki Kazunobu
Yukihisa Inazumi
Yukihisa Inazumi
Application Number:
JP2006119933A
Publication Date:
September 14, 2011
Filing Date:
April 24, 2006
Export Citation:
Assignee:
Tanigaki Kenko Co., Ltd.
Mining Industry Co., Ltd.
Mining Industry Co., Ltd.
International Classes:
E21B3/06; E21B19/02
Domestic Patent References:
| JP2002256788A | ||||
| JP8312278A | ||||
| JP5287975A |
Attorney, Agent or Firm:
Yoshihisa Nishi