Document Type and Number:
Japanese Patent JPS533901
Kind Code:
U
Application Number:
JP8440776U
Publication Date:
January 14, 1978
Filing Date:
June 26, 1976
Export Citation:
International Classes:
E21B17/03; E21B1/00; (IPC1-7): E21C15/00
Domestic Patent References:
| JPS5032482U | 1975-04-09 |
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