Title:
【発明の名称】ケーシングつきオーガスクリュー掘削機
Document Type and Number:
Japanese Patent JP3066772
Kind Code:
B2
Inventors:
Etsuo Hirakawa
Application Number:
JP6247391A
Publication Date:
July 17, 2000
Filing Date:
March 05, 1991
Export Citation:
Assignee:
Sanwa Equipment Co., Ltd.
International Classes:
E21B3/02; E21B7/00; (IPC1-7): E21B7/00
Domestic Patent References:
| JP60133189A | ||||
| JP3119039U | ||||
| JP55178090U | ||||
| JP4811606B1 |
Attorney, Agent or Firm:
Takefumi Tanaka (1 person outside)