Title:
拡大翼を備えた掘削装置及び掘削方法
Document Type and Number:
Japanese Patent JP5295910
Kind Code:
B2
More Like This:
Inventors:
Hiroaki Shimizu
Application Number:
JP2009195797A
Publication Date:
September 18, 2013
Filing Date:
August 26, 2009
Export Citation:
Assignee:
Japan Pile Co., Ltd.
International Classes:
E21B44/00
Domestic Patent References:
| JP61186617A | ||||
| JP2008150834A | ||||
| JP7311133A |
Attorney, Agent or Firm:
Keiji Nemoto