Title:
UNDERGROUND DRILLING APPARATUS
Document Type and Number:
Japanese Patent JPS61221486
Kind Code:
A
Inventors:
FUJIMORI MITSUHARU
Application Number:
JP5815485A
Publication Date:
October 01, 1986
Filing Date:
March 25, 1985
Export Citation:
Assignee:
KATO SEISAKUSHO KK
International Classes:
E21B7/20; E21B3/025; E21B7/00; (IPC1-7): E21B7/22
Attorney, Agent or Firm:
Jiro Sendo