Title:
【発明の名称】地中孔掘削装置におけるドレーテラーとケーシングとの脱着構造
Document Type and Number:
Japanese Patent JP2902583
Kind Code:
B2
Inventors:
HIROSE KAORU
Application Number:
JP27653895A
Publication Date:
June 07, 1999
Filing Date:
September 28, 1995
Export Citation:
Assignee:
DAIYO KIKO KOGYO KK
International Classes:
E21B7/20; E21B17/02; E21B17/08; E21B19/16; (IPC1-7): E21B17/02; E21B19/16
Domestic Patent References:
| JP710094U |
Attorney, Agent or Firm:
Mikito Tanaka