Title:
PLURAL HOLE DRILLING MACHINE FOR SLIT HOLE DRILLING
Document Type and Number:
Japanese Patent JPS5862287
Kind Code:
A
Inventors:
MIWA SATORU
Application Number:
JP15864581A
Publication Date:
April 13, 1983
Filing Date:
October 07, 1981
Export Citation:
Assignee:
SANWA ENG
International Classes:
E21B7/02; E21B15/00; E21B19/08; (IPC1-7): E21C11/00
Domestic Patent References:
| JPS54139801A | 1979-10-30 |