Title:
CONTROL APPARATUS IN EARTH DRILL
Document Type and Number:
Japanese Patent JPS5894592
Kind Code:
A
Inventors:
TAKEDA KOUJI
Application Number:
JP19177981A
Publication Date:
June 04, 1983
Filing Date:
December 01, 1981
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
E21B44/00; E21B44/02; (IPC1-7): E21B44/00
Attorney, Agent or Firm:
Masami Akimoto