Title:
クローラドリル及びその穿孔方法
Document Type and Number:
Japanese Patent JP4467663
Kind Code:
B2
Inventors:
Tsutomu Kaneko
Application Number:
JP11682799A
Publication Date:
May 26, 2010
Filing Date:
April 23, 1999
Export Citation:
Assignee:
Furukawa Metal Co., Ltd.
International Classes:
E21B7/02; E21B15/04; E21B15/00; E21B19/08
Domestic Patent References:
| JP6053693U | ||||
| JP58050290A | ||||
| JP6027288U | ||||
| JP7032242Y2 | ||||
| JP60032489U | ||||
| JP61010351U | ||||
| JP46020122B1 |
Attorney, Agent or Firm:
Tetsuya Mori
Yoshiaki Naito
Cui Shu Tetsu
Tadayuki Miyazaki
Yoshiaki Naito
Cui Shu Tetsu
Tadayuki Miyazaki