Title:
【発明の名称】掘削機の掘削ロッド連結装置
Document Type and Number:
Japanese Patent JP3057433
Kind Code:
B2
Inventors:
Satoshi Ito
Application Number:
JP28391497A
Publication Date:
June 26, 2000
Filing Date:
October 16, 1997
Export Citation:
Assignee:
Ito Industry Co., Ltd.
International Classes:
E21B19/20; E21B17/04; (IPC1-7): E21B17/04
Domestic Patent References:
| JP8100588A |
Other References:
【文献】実用新案登録2535618(JP,Y2)
Attorney, Agent or Firm:
Shinichi Harada