Title:
地山補強用打ち込み鋼管における穿孔ビット
Document Type and Number:
Japanese Patent JP4318603
Kind Code:
B2
Inventors:
Hideki Nakamura
Tetsuya Yokoyama
Kenji Hirose
Tetsuya Yokoyama
Kenji Hirose
Application Number:
JP2004193365A
Publication Date:
August 26, 2009
Filing Date:
June 30, 2004
Export Citation:
Assignee:
Okumura Gumi Co., Ltd.
Toho Metal Co., Ltd.
Toho Metal Co., Ltd.
International Classes:
E21B10/38; E21B7/00; E21D9/04
Domestic Patent References:
| JP8338191A | ||||
| JP7042859U | ||||
| JP10169354A |
Attorney, Agent or Firm:
Takuya Yamamoto