Title:
METHOD OF CONSTRUCTION OF LARGE HOLE DIAMETER UNIFORM VELOCITY EXCAVATION
Document Type and Number:
Japanese Patent JPS5689687
Kind Code:
A
Inventors:
SHIGA SHIYUNTAROU
Application Number:
JP16742179A
Publication Date:
July 21, 1981
Filing Date:
December 22, 1979
Export Citation:
Assignee:
RIYOUBI KISO KK
International Classes:
E21B7/00; E21B3/00; (IPC1-7): E21B3/00
Domestic Patent References:
| JPS5024684A | 1975-03-15 |