Document Type and Number:
Japanese Patent JPS5540005
Kind Code:
U
Application Number:
JP12050878U
Publication Date:
March 14, 1980
Filing Date:
September 04, 1978
Export Citation:
International Classes:
E02D15/06; E21B1/00; E21B1/04; (IPC1-7): E21B1/00; E02D15/06
Domestic Patent References:
| JPH0211593U | 1990-01-24 |