Title:
【発明の名称】掘削工具および掘削工法
Document Type and Number:
Japanese Patent JP3385223
Kind Code:
B2
Inventors:
Takeshi Hayashi
Kazuyoshi Yoshida
Kazuhiro Takagi
Hiroyuki Fukuda
Jun Muta
Takeo Sonoda
Kazuyoshi Yoshida
Kazuhiro Takagi
Hiroyuki Fukuda
Jun Muta
Takeo Sonoda
Application Number:
JP36570098A
Publication Date:
March 10, 2003
Filing Date:
December 22, 1998
Export Citation:
Assignee:
Mitsubishi Materials Corporation
Kashima Construction Co., Ltd.
Kashima Construction Co., Ltd.
International Classes:
E21B10/00; E21B10/60; (IPC1-7): E21B10/60
Domestic Patent References:
| JP932454A | ||||
| JP4630083B1 |
Attorney, Agent or Firm:
Masatake Shiga (9 outside)
Masatake Shiga
Masatake Shiga