Title:
【発明の名称】トンネルの削孔方法
Document Type and Number:
Japanese Patent JP2700722
Kind Code:
B2
Inventors:
Takeo Saito
Yoshiaki Ishida
Nobuyuki Fukunaga
Kimura Mutshiko
Yasuo Mitoki
Yoshiaki Ishida
Nobuyuki Fukunaga
Kimura Mutshiko
Yasuo Mitoki
Application Number:
JP7656191A
Publication Date:
January 21, 1998
Filing Date:
April 09, 1991
Export Citation:
Assignee:
Sato Industry Co., Ltd.
International Classes:
E21B7/02; E21B15/00; E21B19/08; E21D9/00; E21D20/00; (IPC1-7): E21D9/00
Domestic Patent References:
| JP1287394A | ||||
| JP62268492A | ||||
| JP6357598B2 |
Attorney, Agent or Firm:
Yoshihisa Nagai