Title:
掘削作業軸の軸継手
Document Type and Number:
Japanese Patent JP4284681
Kind Code:
B2
Inventors:
Kazuo Yamasaki
Application Number:
JP2004061648A
Publication Date:
June 24, 2009
Filing Date:
March 05, 2004
Export Citation:
Assignee:
Sanwa Equipment Co., Ltd.
International Classes:
E21B17/04
Domestic Patent References:
| JP2000038720A | ||||
| JP7031932U | ||||
| JP2002349783A | ||||
| JP61015394U | ||||
| JP2256788A |
Attorney, Agent or Firm:
Takefumi Tanaka
Chiaki Shinseki
Chiaki Shinseki