Title:
【発明の名称】掘削ロッドの緩み止め装置
Document Type and Number:
Japanese Patent JP3367445
Kind Code:
B2
Inventors:
Takeshi Hayashi
Kazuyoshi Yoshida
Hitaya Hisada
Kazuyoshi Yoshida
Hitaya Hisada
Application Number:
JP4548399A
Publication Date:
January 14, 2003
Filing Date:
February 23, 1999
Export Citation:
Assignee:
Mitsubishi Materials Corporation
International Classes:
E21B17/02; (IPC1-7): E21B17/02
Domestic Patent References:
| JP533345A |
Attorney, Agent or Firm:
Masatake Shiga (8 outside)