Title:
EXCAVATING PIPE AND ASSEMBLY OF SAME
Document Type and Number:
Japanese Patent JPS5578788
Kind Code:
A
Inventors:
UIRIAMU ROBAATO GIYARETSUTO
Application Number:
JP15186878A
Publication Date:
June 13, 1980
Filing Date:
December 06, 1978
Export Citation:
Assignee:
SMITH INTERNATIONAL
International Classes:
E21B17/00; (IPC1-7): E21B17/00
Domestic Patent References:
| JPS479305A | ||||
| JPS4017921Y1 |