Title:
掘削工具
Document Type and Number:
Japanese Patent JP4049015
Kind Code:
B2
Inventors:
Hitoya Hisada
Takeshi Hayashi
Kazuyoshi Nakamura
Takeshi Hayashi
Kazuyoshi Nakamura
Application Number:
JP2003133235A
Publication Date:
February 20, 2008
Filing Date:
May 12, 2003
Export Citation:
Assignee:
Mitsubishi Materials Corporation
International Classes:
E21B10/44; E21B3/02; E21B10/00; E21D9/04
Domestic Patent References:
| JP2002138786A | ||||
| JP2002161688A | ||||
| JP2001140578A |
Attorney, Agent or Firm:
Masatake Shiga
Tadashi Takahashi
Masakazu Aoyama
Akihiko Eguchi
Hideyuki Sugiura
Yasuhiko Murayama
Noriko Yanai
Tadashi Takahashi
Masakazu Aoyama
Akihiko Eguchi
Hideyuki Sugiura
Yasuhiko Murayama
Noriko Yanai