Title:
DRILLING APPARATUS
Document Type and Number:
Japanese Patent JPS59187991
Kind Code:
A
Inventors:
BUARUTERU MAIERUHOOFUERU
Application Number:
JP6346984A
Publication Date:
October 25, 1984
Filing Date:
April 02, 1984
Export Citation:
Assignee:
VER EDELSTAHLWERKE AG
International Classes:
E21B1/00; E21B1/26; E21B19/16; (IPC1-7): E21B19/16; E21C3/20
Attorney, Agent or Firm:
Osamu Nakahira