Title:
DRILLING ROD EXTENDING CONNECTOR
Document Type and Number:
Japanese Patent JPS5310301
Kind Code:
A
Inventors:
SHIYOUJI MASAHARU
Application Number:
JP8399976A
Publication Date:
January 30, 1978
Filing Date:
July 16, 1976
Export Citation:
Assignee:
SHIYOUJI MASAHARU
International Classes:
E21B17/042; E21B17/02; E21B17/046; (IPC1-7): E21B17/02; E21C15/00
Domestic Patent References:
| JPS3728006Y1 |
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