Title:
【発明の名称】ケ-シング掘削機の自重制御油圧回路
Document Type and Number:
Japanese Patent JP2908682
Kind Code:
B2
Inventors:
KUWAMORI SEIICHIRO
Application Number:
JP32365993A
Publication Date:
June 21, 1999
Filing Date:
December 22, 1993
Export Citation:
Assignee:
SUMITOMO KENKI KK
International Classes:
E21B3/04; E02D7/20; E02D7/22; E21B7/20; (IPC1-7): E21B7/20
Domestic Patent References:
| JP4122793U |
Attorney, Agent or Firm:
Isamu Ohashi (1 outside)