Title:
掘削機の拡大ヘッド開閉装置
Document Type and Number:
Japanese Patent JP4755008
Kind Code:
B2
Inventors:
Yabuuchi Sadao
Mitsumasa Oigawa
Mitsumasa Oigawa
Application Number:
JP2006108649A
Publication Date:
August 24, 2011
Filing Date:
April 11, 2006
Export Citation:
Assignee:
Japan Pile Co., Ltd.
International Classes:
E21B10/32; E02D7/00; E21B7/00
Domestic Patent References:
| JP9144466A | ||||
| JP2004293264A | ||||
| JP2006029542A |
Attorney, Agent or Firm:
Satoshi Kumon
Kumon enjoyment
Kumon enjoyment