Title:
HOLE FORMING APPARATUS AND CONTROL THEREOF
Document Type and Number:
Japanese Patent JPS58213988
Kind Code:
A
Inventors:
BUARUTERU MAIERUHOOFUERU
Application Number:
JP9500182A
Publication Date:
December 13, 1983
Filing Date:
June 04, 1982
Export Citation:
Assignee:
VER EDELSTAHLWERKE AG
International Classes:
E21B7/02; E21B15/00; E21B19/08; (IPC1-7): E21C11/00
Attorney, Agent or Firm:
Osamu Nakahira