Title:
【発明の名称】掘削機
Document Type and Number:
Japanese Patent JP2786476
Kind Code:
B2
Inventors:
CHIBA KOKI
Application Number:
JP11912789A
Publication Date:
August 13, 1998
Filing Date:
May 12, 1989
Export Citation:
Assignee:
ISHIKAWAJIMA KENKI KK
International Classes:
E21B15/00; E21B3/02; (IPC1-7): E21B15/00
Domestic Patent References:
| JPS6145274U | ||||
| JPS6327513A | ||||
| JPS6234136A |
Attorney, Agent or Firm:
Tsunemitsu Yamada (1 person outside)