Title:
CONTROLLER IN EARTH DRILL
Document Type and Number:
Japanese Patent JPS58127895
Kind Code:
A
Inventors:
TAKEDA KOUJI
Application Number:
JP952382A
Publication Date:
July 30, 1983
Filing Date:
January 26, 1982
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
E21B44/00; E21B44/06; (IPC1-7): E21B44/00
Attorney, Agent or Firm:
Masami Akimoto
Previous Patent: JPS58127894
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