Title:
HOLE EXPANDER
Document Type and Number:
Japanese Patent JPS5589594
Kind Code:
A
More Like This:
| JP3706039 | EXCAVATOR |
| JP2633154 | SHAFT EXCAVATION METHOD |
Inventors:
KAWASAKI HIROYUKI
HAMAMURA HIROYUKI
HAMAMURA HIROYUKI
Application Number:
JP16494978A
Publication Date:
July 07, 1980
Filing Date:
December 26, 1978
Export Citation:
Assignee:
TONE BORING CO
International Classes:
E21B7/28; E21B10/32; E21B21/00; (IPC1-7): E21B7/28