Title:
縦穴掘削機及び装置
Document Type and Number:
Japanese Patent JP4034196
Kind Code:
B2
Inventors:
Kazuo Shibata
Application Number:
JP2003022326A
Publication Date:
January 16, 2008
Filing Date:
January 30, 2003
Export Citation:
Assignee:
Kazuo Shibata
International Classes:
E21B3/00; E02D7/22
Domestic Patent References:
| JP9256768A | ||||
| JP57008154U | ||||
| JP59010365U |
Attorney, Agent or Firm:
Hidekazu Miyoshi
Masakazu Ito
Masakazu Ito