Title:
アースドリル
Document Type and Number:
Japanese Patent JP4693713
Kind Code:
B2
Inventors:
Junichi Hizawa
Masanori Watanabe
Masanori Watanabe
Application Number:
JP2006186135A
Publication Date:
June 01, 2011
Filing Date:
July 05, 2006
Export Citation:
Assignee:
Hitachi Sumitomo Heavy Industries Construction Crane Co., Ltd.
International Classes:
E21B11/00; E21B15/00
Domestic Patent References:
| JP4022584U | ||||
| JP2001164865A |
Attorney, Agent or Firm:
Katsuichi Wakata