Title:
二重管式掘削工具
Document Type and Number:
Japanese Patent JP4007216
Kind Code:
B2
Inventors:
Hitoya Hisada
Takeshi Hayashi
Kazuyoshi Nakamura
Kunihiko Tanaka
Takeshi Hayashi
Kazuyoshi Nakamura
Kunihiko Tanaka
Application Number:
JP2003067067A
Publication Date:
November 14, 2007
Filing Date:
March 12, 2003
Export Citation:
Assignee:
Mitsubishi Materials Corporation
International Classes:
E21B6/00
Domestic Patent References:
| JP5149072A | ||||
| JP3055386A | ||||
| JP8177366A | ||||
| JP10205260A |
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