Title:
アースドリル
Document Type and Number:
Japanese Patent JP4762212
Kind Code:
B2
Inventors:
Tokuo Murate
Yamashita
Nobuhiro Matsuzawa
Yamashita
Nobuhiro Matsuzawa
Application Number:
JP2007213421A
Publication Date:
August 31, 2011
Filing Date:
August 20, 2007
Export Citation:
Assignee:
Nippon Vehicle Manufacturing Co., Ltd.
International Classes:
E21B11/00; E21B17/07
Domestic Patent References:
| JP4047273Y2 | ||||
| JP5052086A | ||||
| JP4302691A | ||||
| JP2003278474A | ||||
| JP2003328675A |
Attorney, Agent or Firm:
Kazuhiko Kido
Yoshihiko Kido
Yoshihiko Kido