Document Type and Number:
Japanese Patent JPS4973303
Kind Code:
A
Application Number:
JP11378873A
Publication Date:
July 16, 1974
Filing Date:
October 09, 1973
Export Citation:
International Classes:
E21B10/04; E21B44/00; E21B45/00; E21B47/00; E21B49/00; (IPC1-7): G01D9/28
Domestic Patent References:
| JPS4838204A | 1973-06-05 |